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80ac38e7c20418238a3df501c038a5f33dd4d4ad
subsection
213
319
Finding solutions.
It is easy to check numerically in the asymptotic finite-volume solution that \log \textbf {B} and \log \textbf {H} satisfy the requirements mentioned above in both the undeformed and deformed case. We assume this extends beyond the asymptotic solution, yielding a solution of the finite-difference equation (REF ). In p...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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c6b35b41fcdf897cd2e76cabd48c84b6583ef2bf
subsection
214
319
Constructing
Now we have constructed an upper-band gauge with good properties we can continue building good gauges for the other two wings of the T hook. We will focus on the construction of a good gauge \mathbb {T}_R (simply written as \mathbb {T} to avoid heavy notation) for the right hook, since the construction for the left and...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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0d38a1da5582352097a8295913cc934a46db52f9
subsection
215
319
Defining
We directly define the \mathbb {T} gauge from the \textbf {T} gauge through the transformation\mathbb {T}_{a,s} = (-1)^{as} \textbf {T}_{a,s} \left(\textbf {T}_{0,1}^{[a+s-1]}\right)^{\frac{a-2}{2}}.One can check directly that this gauge satisfies the Hirota equation on the T hook using the fact that \textbf {T} does. ...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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b7ece7e04053a1d5f921822414b0a217d53f33e9
subsection
216
319
Defining
Indeed, the ratior= \frac{1+1/Y_{2,2}}{1+Y_{1,1}} = \frac{\mathcal {T}_{2,2}^+\mathcal {T}_{2,2}^-\mathcal {T}_{0,1}}{\mathcal {T}_{1,1}^+\mathcal {T}_{1,1}^-\mathcal {T}_{2,3}}is expressed in right-band \mathcal {T} functions only and satisfies r(u+i\epsilon )=1/r(u-i\epsilon ) for u \in \check{Z}_{0} due to eqn. (REF...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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3c88216d1b2cea433025ec15b522bab1644dcc3d
subsection
217
319
Short-cutted
First of all, we can consider short-cutted versions of the \mathcal {T} gauge. These functions can be found by continuation and are given by\hat{\mathcal {T}}_{0,s} &= 1, \\\hat{\mathcal {T}}_{1,s} &= s + \hat{G}^{[+s]}-\hat{G}^{[-s]}, \\\hat{\mathcal {T}}_{2,s} &= \left(1 + \hat{G}^{[s+1]}-\hat{G}^{[s-1]}\right)\left(...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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340c89893e6f9083c4eeb7299d4879bea6ce4e61
subsection
218
319
Step 3: the
Having defined the \mathcal {T} gauge we can see how it relates to the \mathbb {T} gauge defined before, since two gauges parametrising the same set of Y functions are related by a gauge transformation, as in eqn. (). This will show all the wanted properties of the \mathbb {T} gauge.The first thing to check is that the...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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25d3c5320890946b335a68d3c0ccaceef7019071
subsection
219
319
Step 3: the
If we want to apply the conjugate bar to the shifts we write \overline{f^+}.\mathbb {T}_{1,s} = \left( \left(\frac{f_1}{f_1^{--}}\right)^{[s]} \times \left(\frac{\overline{f_1}}{\overline{f_1}^{++}}\right)^{[-s]} \right) \mathcal {T}_{1,s} \text{ for } s\ge 1,which shows that \mathbb {T}_{1,s} \in \mathcal {A}_s, as de...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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167d27878e0a94c6a8dc961270aba80e969949ab
subsection
220
319
Step 4.1: is
The real difficulty is to prove that the \mathbb {T} gauge is actually \mathbb {Z}_4-symmetric. We will go through the following steps: first we will prove that the product \hat{\mathbb {T}}_{1,1}\hat{\mathbb {T}}_{1,-1} has only two cuts at Z_{\pm 1}. Second we will show that we can force each of these functions to ha...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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f5a4fe94b1267992b07193d4849ea1a9a5d11e30
subsection
221
319
Step 4.1: is
We use the analyticity of the \textbf {T} and \mathbb {T} gauges to telescope the sums in the expression above:\left[\log \left(\frac{\mathbb {T}_{1,1}^+ \mathbb {T}_{1,-1}^+ }{\dot{\mathbb {T}}_{1,1}^+ \dot{\mathbb {T}}_{1,-1}^+} \frac{\textbf {T}_{0,1}\textbf {T}_{0,-1}}{\textbf {T}_{1,1}^+\textbf {T}_{1,-1}^+}\right...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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13c5f1ae6bdf84f44f7a63fed1c986fefe65ed3e
subsection
222
319
Step 4.1: is
Going through the analytic and group-theoretical properties of \textbf {T} one finds that nothing changes after transforming them as\textbf {T}_{a,s} \rightarrow \left(\prod _{k=-(|s|-1)/2}^{(|s|-1)/2} \frac{e^{i \phi ^{[a+2k]}}}{e^{i \phi ^{[-a+2k]}}} \right)^{\text{sgn}(s)} \textbf {T}_{a,s},as long as \phi is real w...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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c9357f2fd5b92ad273542b8c0e674cbecfc8d0de
subsection
223
319
Step 4.1: is
Now, since we want \hat{\mathbb {T}}_{1,1}^{\text{new}} to have only two Z_{\pm 1}-cuts we should cancel any extra cuts in \hat{\mathbb {T}}_{1,1} through \phi :i \left[\,\hat{\phi } \, \right]_{-2N}= - \left[ \log \hat{\mathbb {T}}_{1,1}\right]_{-1-2N},\quad i \left[\,\bar{\hat{\phi }} \, \right]_{2N}= \left[ \log \ha...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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79bf0c9042150ba94812216ebcf2ee5537de21c9
subsection
224
319
Step 4.2: actually proving
The gauge transformation (REF ) can be written like\mathbb {T}_{1,s} = h^{[+s]}\bar{h}^{[-s]}\mathcal {T}_{1,s}where h is a function analytic in the upper half-plane. Translating this equation for s=1 to the short-cutted sheet reads\hat{\mathbb {T}}_{1,1} = \hat{h}^{+}\bar{\hat{h}}^{-}\hat{\mathcal {T}}_{1,1}.Knowing t...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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bac0721ad248cd06454b18b11ad4e9fbfaa17971
subsection
225
319
Step 4.2: actually proving
Consider u\in \hat{Z}_0, then we have\mathbb {T}_{2,3}=\hat{\mathbb {T}}_{2,3},\quad \mathbb {T}_{2,2}(u\pm i c)=\hat{\mathbb {T}}_{2,2}(u\pm i c\mp i\epsilon ),\quad \mathbb {T}_{1,1}(u\pm i c)=\hat{\mathbb {T}}_{1,1}(u\pm i c\mp i\epsilon ).Additionally we find from the gauge transformation that\hat{\mathbb {T}}_{2,s...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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7f8ffd3c70dfa844651068c24518313fad5e15c8
subsection
226
319
Step 4.2: actually proving
(REF ) and then using these properties we get successively\mathbb {T}_{1,1}^+\mathbb {T}_{1,1}^--\mathbb {T}_{1,0}\mathbb {T}_{1,2} = \frac{\mathbb {T}_{2,2}^+\mathbb {T}_{2,2}^--\mathbb {T}_{3,2}\mathbb {T}_{1,2}}{\mathbb {T}_{2,3}},\hat{\mathbb {T}}_{1,1}^{[+1-\epsilon ]}\hat{\mathbb {T}}_{1,1}^{[-1+\epsilon ]}+\left...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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851734e49a8f7e8e003bc17d25b239da8c1e64fa
subsection
227
319
Step 4.2: actually proving
Using the regularity requirement that our \hat{\mathbb {T}}s do not have any poles except possibly at the branch points we want \hat{h} to be pole and zero free. For the undeformed case numerical analysis showed in that \hat{h} could grow at most polynomially as u \rightarrow \infty , implying that \bar{\hat{h}}/\hat{h...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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853d0593c25c91d30eff92773231e11eae0f4edf
subsection
228
319
A step back
Let's take a step back and see what we have achieved so far: we started out with the analytic Y-system and constructed four gauges {T}, \textbf {T}, \mathcal {T} and \mathbb {T}. The first two gauges have good analyticity properties (see table ) in the upper band of the T hook , and the \textbf {T} gauge has particular...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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deecfe3d26c826fcef4315f34af5b33ecbb5506d
subsection
229
319
Wronskian parametrisation
As anticipated in the previous section we can use further simplify the \hat{\mathbb {T}} gauge by noticing that the analytical continuation discussed in section REF can also be applied to the \hat{\mathbb {T}} gauge, resulting in a solution to the Hirota equation on a horizontal infinite band of width two. The general ...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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826acc2796f0f5a2fa01bbc4846995301665accf
subsection
230
319
Wronskian parametrisation
One can check that there also exists a scalar symmetryp_i \rightarrow A p_i,\quad q_i \rightarrow A^{-1} q_i,where A has the same periodicity properties as the components of H. The more general n-band solution has another scalar symmetry, but that is trivial for n=2.To find an explicit solution for our case, we will ha...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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fd108b1098d25805c20b0c84557127d75267c678
subsection
231
319
Wronskian parametrisation
From the parametrisation we see that the q_i should satisfy a system of Baxter equations\hat{q}^{[2r-1]}\hat{\mathbb {T}}_{1,1} & = \hat{q}^+\hat{\mathbb {T}}_{1,r}^{[r-1]} - \hat{q}^-\hat{\mathbb {T}}_{1,r-1}^{[r]} \\\hat{q}^{[-2r+1]}\hat{\mathbb {T}}_{1,1} & = \hat{q}^-\hat{\mathbb {T}}_{1,r}^{[-r+1]} - \hat{q}^+\hat...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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8cf3c3954f292548813413bc9bff688b7a3e80ce
subsection
232
319
Wronskian parametrisation
The simplest choice for this kernel isK_c(u) = \zeta (u) -\zeta (u+2\pi ) +\zeta (2\pi ),with \zeta the quasi-elliptic Weierstraß  function with quasi-halfperiods (2\pi , ic). This kernel is elliptic and has exactly two simple poles in its fundamental parallelogram with residues 1 and -1. If we take discontinuities on ...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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048912c39d1c1659e04b8014e7127d6f7d7eef43
subsection
233
319
Conclusions
In this chapter we have found basic building blocks for the TBA Y-functions in the form of four T-gauges. In particular, the \mathbb {T} and \textbf {T} gauges have good properties and parametrise the entire T-hook in an efficient way. Moreover, after discovering that the short-cutted version of the left and right \mat...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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b3289a5b26015d74655230409ce46d4d7cebc2b9
subsection
234
319
The middle nodes and
Following the group-theoretical properties we see that the middle nodes (0,s) of the \textbf {T} gauge are all generated from a single function \textbf {T}_{0,0}, which by itself is also 2ic-periodic, such that there are only two unique entries on the middle line of the \textbf {T} hook: \textbf {T}_{0,0} = \textbf {T}...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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6b37250dafa2bfd601eae91653223c80de3e0183
subsection
235
319
Switching conventions.
We would like to switch from the lower-half-plane conventions to the upper-half-plane conventions: this can be easily achieved by flipping the sign of u, u\rightarrow -u. This changes only:\check{f} = \hat{f} \text{ in the strip } 0> \text{Im}(u)>-c\quad &\Longrightarrow \quad \check{f} = \hat{f} \text{ in the strip } ...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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c66eebffaa9a69b0d74a804bb53c282edc83e195
subsection
236
319
Introducing extra
As mentioned before, to constrain the \mathbf {P} functions and \mu _{12} we need to extract information from the analyticity of the upper band . Using the gauge transformation (REF ) we find for example that\textbf {T}_{2,1} = \left(\tilde{\mathbf {P}}_1 \mathbf {P}_{2}^{[-2]} - \tilde{\mathbf {P}}_2 \mathbf {P}_{1}^{...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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1c7c1313edea05434e37b9d0b5521362eed6b029
subsection
237
319
Introducing extra
We can reinterpret these equations as those expressing the analyticity of four new \mathbf {P} functions \mathbf {P}^1, \mathbf {P}^2, \mathbf {P}_3 and \mathbf {P}_4 on all the Z_n for n\ne 0, defined as follows: first consider 2 ic-periodic solutions \mu _{\alpha 3} and \mu _{\alpha 4} (for a = 1,2) of the following ...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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99f793ed395a78f1de8889faeeed503f6345b847
subsection
238
319
Introducing extra
This analytic structure is illustrated in fig. REF . [Figure: The analytic structure of the \mathbf {P}_a in the undeformed (a) and the deformed (b) case. The thick line indicates the only branch cut on the first sheet. The continuation of \mathbf {P}_a from the first sheet to the second sheet is indicated by a solid p...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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48ad4befc2e998e0b38133aee4755c73abe0d1e2
subsection
239
319
Solving the Riemann-Hilbert problem.
In order for the above construction to work we need to know that the newly introduced \mu functions actually exist. For that we should show that the Riemann-Hilbert problem (REF ) has a solution in both the undeformed and the deformed case. Note that these equations are of the form\tilde{f}-f= g,where in the deformed c...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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0adaeaca1f19b40722f9892ad7bf3684ccbd0019
subsection
240
319
Combining the relations.
So far we have introduced eight \mathbf {P} functions \mathbf {P}_a and \mathbf {P}^a with a=1,\ldots ,4 and five \mu functions \mu _{12}, \mu _{1 3}, \mu _{23}, \mu _{14} and \mu _{24}, which are constrained by the equations (REF ), (REF ), (REF ) and (REF ). We can introduce one more \mu function to fill the upper tr...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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959df159e5f4a0492f102f2fa95870b834e739c7
subsection
241
319
Combining the relations.
It is because of this that the \mathbf {P}\mu system is identical for both the undeformed and the deformed case.By introducing the inverse of the \mu matrix with upper indices as \mu _{ab} \mu ^{bc} = \delta ^c_a we also find the upper-index form of the \mathbf {P}\mu system\tilde{\mu }^{ab}-\mu ^{ab} = -\mathbf {P}^a ...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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a805da97cc7683ca810e1052e84334bc2f54fef5
subsection
242
319
Conjugation properties of
We can use the \mathbf {P}\mu system to derive the conjugation properties of \mu : first we show that on \mathbf {P} functions conjugation and continuation by the tilde commute, by assuming that all \mathbf {P} functions can be expressed as a real function times a convergent series in the x function. To show then that ...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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0f069441c7b04d7956bf0a88ecfe9817efcde70a
subsection
243
319
Information from TBA
Our task is to find some property of the QSC functions \mathbf {P}, \mathbf {Q}, \mu and \omega that depends on the quantum numbers of the state we would like to compute the energy of.For good measure, let us mention here that in the undeformed case the AdS/CFT correspondence implies that this is the same as computing ...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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2fe9df2d3da0dfcb0071d9f58766574dcc01b31a
subsection
244
319
Connecting the
The ratio Y^{(\alpha )}_+ / Y^{(\alpha )}_- does not depend on \alpha , as we see from the TBA equations (REF ):\frac{Y_+^{(\alpha )}}{Y_-^{(\alpha )}} = \exp \left( \Lambda _P \star K^{Py}\right).In the following we will omit \alpha and find an expression in the \mathbf {P}\mu system that equals these two quantities. ...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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6c21a25e3cfc7bb812d09b3ef93f67729ae2dc35
subsection
245
319
Connecting the
We see here for example that we get inequivalent results if we had chosen the short-cutted \mu _{12}: in that case so\mathbb {T}_{3,2} = \mathbb {T}_{2,3}\mu _{12}^{[+4]} = \mathbb {T}_{2,3}\mu _{12}instead of \hat{\mu }_{12}^{[+4]}, which does not have a clear simplification on the short-cutted sheet. Now we find\frac...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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0bb486a2b14c1ac45b6ce79da33704bd9aa3765b
subsection
246
319
Connecting the
Now we can find \mathbb {T}_{1,0}:\mathbb {T}_{1,1}^+\mathbb {T}_{1,1}^- &= \mathbb {T}_{0,1}\mathbb {T}_{2,1}+\mathbb {T}_{1,0}\mathbb {T}_{1,2} = \mathbb {T}_{2,1}+\mathbb {T}_{1,0}\mathbb {T}_{1,2} \\\mathbb {T}_{1,0} &= \frac{\mathbb {T}_{1,1}^+\mathbb {T}_{1,1}^- - \mathbb {T}_{2,1}}{\mathbb {T}_{1,2}} = \frac{\ti...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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bd4a63263a4efe15f9af91483a10cd4d826a9309
subsection
247
319
Connecting the
We therefore find in terms of short cuts that&\hat{\mathbb {T}}_{1,0} = \mu _{12}+\\&\frac{\left( \mathbf {P}_1^{[+2]}\tilde{\mathbf {P}}_2-\tilde{\mathbf {P}}_1\mathbf {P}_2^{[+2]} \right)\left(\mathbf {P}_1\mathbf {P}_2^{[-2]}-\mathbf {P}_1^{[-2]}\mathbf {P}_2 \right)- \left(\mathbf {P}_1^{[+2]}\mathbf {P}_2-\mathbf ...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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9c9b2b7a36a519f1b2996a9cd13759a521cb3760
subsection
248
319
Sensitivity to conventions.
An important aspect of this derivation is that it is sensitive to where we say long- and short-cutted versions of functions should coincide: slightly above or slightly below the real axis. In the derivation above we chose the upper-half-plane convention that functions agree just above the real axis. Let us see what cha...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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cf004b61f7760064157a83077dbf56fb9714a75c
subsection
249
319
Sensitivity to conventions.
Note first now that the equation relating \mu _{12} to \tilde{\mu }_{12} gets deduced from the absence of a discontinuity for \textbf {T}_{2,1} on Z_0 and this condition gets changed as a result of our choice, taking the form\mu _{12}-\tilde{\mu }_{12}= \mathbf {P}_1\tilde{\mathbf {P}}_2-\tilde{\mathbf {P}}_1\mathbf {P...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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fab90c5f6b4848c44dab5ccd3a1a26950f1b9c62
subsection
250
319
Undeformed derivation
The previous sections have shown that\frac{\mu _{12}^{\pm \pm }}{\mu _{12}} = \exp \left( \Lambda _P \star K^{Py}\right) = \exp \left( \Lambda _P \star \left( K(v+icQ,u ) - K(v-i cQ,u )\right)\right),with the sign depending on the chosen conventions. For now we will choose the lower-half-plane conventions, as the kerne...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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7be13272c3976ab3a908291d7349e8b04ba33e40
subsection
251
319
Undeformed derivation
This implies that \begin{equation}\log \frac{\mu _{12}^{--}}{\mu _{12}} = -\frac{2iM}{g u} +\mathcal {O}\left(u^{-2}\right) \end{equation}and after comparison with eqn. (\ref {eq:KPyundeformedexpanded}) we find that M = E. So we find that 12 uE. Can we do something similar in the deformed case?
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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62c8bb13ccbe2082373279424e0b5609666d79e9
subsection
252
319
Now the deformed case
The deformed case is more subtle: first off, it is not clear in which direction we should consider asymptotics, since taking the same limit u\rightarrow \infty does not make sense on a cylinder. Really, the only two asymptotic directions available to us are up and down the cylinder, i.e. u \rightarrow \pm i \infty . In...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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4ea1261b7b56b967146c53fabe2f9b64c18ba4d0
subsection
253
319
Now the deformed case
In short, an ansatz for the asymptotics of \mu _{12} would be\mu _{12} \simeq m(u) e^{i u \alpha },with \simeq meaning that\lim _{u\rightarrow -i \infty }\frac{m(u) e^{i u \alpha }}{ \mu _{12}(u)} = 1,where the limit has to be taken avoiding branch cuts, i.e. here |\text{Re}(u)| > \theta with \alpha \in having positive...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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3f4ea77d215f34cf9613b2e25b6890343831ea8c
subsection
254
319
Remark.
Note that this expression is very similar to its undeformed counterpart \mu _{12} \sim u^{E}, although the way we obtain this expression is subtly different. In the deformed case, we do not find energy and momentum as separate coefficients in the expansion of K^{Py}, but instead they come together already at the lowest...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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332a33bf27d7d9fc92d2af933c62d09a95a70089
subsection
255
319
Comments on the periodicity of the deformed
It is important to note the factor of 1/2 in the exponent in eqn. (REF ), as it implies that for odd integer E the \mu _{12} function is at most anti-periodic instead of periodic. This is exactly a possible situation at lowest order in perturbation theory, where quantum corrections play no role yet. Indeed, at lowest o...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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dec3e790d911d69dad876cc62b9175c8136d408e
subsection
256
319
Comments on the periodicity of the deformed
Instead, E becomes a measure of the jump of \mu _{12} over the line Re(u)=\pi very far in the lower half-plane. This is illustrated in fig. REF .
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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38ae18766bd173a410e4596a6a425d1f9ffcf106
subsection
257
319
Switching to the upper-half-plane conventions
Now that we have performed the analysis in the previous section we can switch permanently to the upper-half-plane conventions. We do this as before (see section REF ), where now we have the additional changes\tilde{\hat{\mu }}_{ab} = \hat{\mu }_{ab}^{--} \quad &\Longrightarrow \quad \tilde{\hat{\mu }}_{ab} = \hat{\mu }...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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cfff1c2e6bcc91b1f568725cd215babf037858f4
subsection
258
319
Anticipating the result
Our actual aim in this chapter is to find whether the basic QSC functions \mathbf {P} and \mathbf {Q} depend on the six quantum numbers (REF ): conjecturing that this is the case states that the QSC as we have derived it can be extended to describe any state in the system, provided we pick up the right “boundary condit...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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29f17030f30bdc10ff16545ffb023d0635f47132
subsection
259
319
Deriving the asymptotics
We can deduce the above asymptotics from consistency of the QSC and the asymptotic behaviour we found for \mu _{12}. For the deformed case we can also use the fact that its asymptotics should limit to the undeformed asymptotics, whereas for the undeformed case we can use the knowledge of the classical spectral curve. I...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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6ba05e8fb6b7b6026a6beee73beaf1067bed5cd9
subsection
260
319
Undeformed asymptotics.
Starting from the fact that \mu _{12} \sim u^E as u\rightarrow \infty We use \sim instead of \simeq to allow for an normalisation constant. we postulate that all the \mathbf {P} and \mathbf {Q} functions have interesting asymptotics in this limit:We refrain from putting an extra label “und" on the quantities in this se...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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79ed1fc5d6cb6fb96ccba4312341ef132e44b0a9
subsection
261
319
Undeformed asymptotics.
(REF ) for the product B_{j_0}B^{j_0}.We can also find asymptotics for \omega and \mu : Since \omega ^{++} = \omega we find that \omega \simeq 1, as this is the only 2i/g-periodic function with power-like asymptotics . Choosing the right \mathbf {Q}_i basis we can choose it to be such that it is anti-symmetric with \om...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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058077f23d57a669a5700101aec9e6cf5c2694c7
subsection
262
319
Deformed asymptotics.
This time we postulate that all the \mathbf {P}_a and \mathbf {Q}_i have interesting asymptotics as we send u\rightarrow i \infty outside the branch cut strip:\mathbf {P}_a \simeq A_a z^{-\tilde{M}_a}, \quad \mathbf {Q}_i \simeq B_i z^{\hat{M}_i}\quad \mathbf {P}^a \simeq A^a z^{\tilde{M}^a}, \quad \mathbf {Q}^i \simeq...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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f4343ab0b3c87261e5dc18c4a16e314f74d3340a
subsection
263
319
Deformed asymptotics.
(REF ) should hold (which in fact it does). Solving these equations again we findA_{a_0}A^{a_0} =2\frac{\prod _{j}\sinh \left( c\frac{\tilde{M}_{a_0}- \hat{M}_{j}}{2}\right)}{\prod _{b\ne a_0} \sinh \left( c\frac{ \tilde{M}_{a_0}- \tilde{M}_{b}}{2}\right)} \qquad \text{ for } a_0=1,\cdots ,4.Performing a similar analys...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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bf7b3ff46090e2f59e7ec9d032c97939e715e3ae
subsection
264
319
Dependence of
Our remaining task now is to find the dependency of the M's on the global charges. In order to deduce this we should consider the following set of constraints on the asymptotics:The \mu _{12} asymptotics have a specified form as follows from the TBA. The sum of \tilde{M}_a and the \hat{M}_i should be equal, see eqn. (...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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b449f3cd199156f0b662cdfc1ac8bfac5b7315eb
subsection
265
319
Deriving the deformed charges.
Obtaining the deformed charges is less straightforward, simply because the classical spectral curve is not known for the \eta -deformed model. We therefore proceed by imposing the constraints listed in the previous paragraph and additionally impose that the dependence on the charges is linear and that the \mathbf {P} a...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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42dd3f87297dbac432bb971cbdd6980e27226b39
subsection
266
319
Deriving the deformed charges.
Hence the subleading term must become leading in the undeformed limit.Since the \mathbf {P}_{3,4} are auxiliary variables anyway, their asymptotics are fixed by consistency of the QSC, hence uniquely in terms of the well-defined undeformed limit of the \mathbf {P}_{1,2}. From this reasoning we find the following compar...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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100f14e47504525ff11a8c6e8e5cd8602d1251f3
subsection
267
319
Putting together the results
For the readers convenience let us summarise all the results. We went through the complete derivation of the quantum spectral curve for the {\rm AdS}_5\times {\rm S}^5 superstring and its \eta deformation. The final form of the \mathbf {P}\mu - and the \mathbf {Q}\omega -system is the same for both models and are\tilde...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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1ff134f1f9e913c6ad61acf013e51c5cecea571f
subsection
268
319
Putting together the results
This can be interpreted as the trigonometric version of the phenomenon in the undeformed case that \mu _{ab} develops a branch point at infinity for non-zero coupling.Although we started from the ground-state TBA-equations we ended up with a proposed set of boundary conditions for the \mathbf {P} and \mathbf {Q} functi...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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95e25491fb0940385316651c59c6e418982b8411
subsection
269
319
Putting together the results
Lastly, due to the presence of trigonometric functions instead of rational functions as in the undeformed case we can rightfully call the \eta -deformed QSC to be a trigonometric QSC.
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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16eef1161cd13d9f018f1a74c25f57dfa7262c7c
subsection
270
319
Checking using weak coupling
We can check the derived quantum spectral curve for the \eta -deformed model and asymptotics by comparing to the Bethe-Yang equations in (REF ). We will zoom in on the \mathfrak {sl}_2 sector of the theory, similar to the analysis done for the undeformed case in . In this sector only three of the global charges (J_1 = ...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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7a8adafd7e2894cd321f1b45c0e85cb282e940b4
subsection
271
319
Checking using weak coupling
This splits the \mathbf {P}\mu system into two parts as in the undeformed case and using some algebra we obtain the following TQ-like equation for Q=\mu _{12}^+:-T Q +\frac{1}{\left(\mathbf {P}_2^-\right)^2}Q^{--}+\frac{1}{\left(\mathbf {P}_2^+\right)^2}Q^{++}=0,where T is given by the following rational function of \m...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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5e97077daeb01946abae610f107895f9cef5c2f2
subsection
272
319
Checking using weak coupling
Using its asymptotics and reality we can use the lemma in appendix to restrict the series to be a trigonometric polynomial. In fact, assuming as in the undeformed case that the pole at the origin has order J/2, the trigonometric polynomial trivialises to a constant, leaving us with\mathbf {P}_2(u) \sim S(u)^{-J/2}.This...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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7625adb6e6c38205585b3436d04ecd509ed6d4fb
subsection
273
319
Intermezzo: why was the road this long?
A very tempting question to ask is why it was not possible to use the undeformed QSC more directly to find its deformed analogue: already on the level of the TBA equations it is clear that the analytic structure of the two cases are very similar: both have square root branch cuts, which come in two types and both deal ...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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4f5050f9bfa950867c0132133b13ec4a8fdaa277
subsection
274
319
Implications from mirror symmetry
As we already explored in chapter , the family of \eta -deformed strings is actually closed under the associated double Wick rotation. Namely, taking \theta \rightarrow \pi - \theta at fixed c is equivalent to a double Wick rotation. To explicitly match the parametrisation this should be combined with a shift u \righta...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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7f9b297d8e068c9f219590b3a13160a64d9bad72
subsection
275
319
Implications from mirror symmetry
In this limit, the cut structure of the QSC is as expected: the \mathbf {P} and \mu functions now have long cuts with branch points \pm 2g,These are the branch points in the conventions of ; we have tacitly continued our discussion in the TBA conventions, where the branch points are located at \pm 2. while the \mathbf ...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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3de768c582690de8159acfffb9d3289d226a2911
subsection
276
319
Conclusions and future work
In this thesis we have derived the quantum spectral curve for the \eta -deformed superstring in a language that allowed us to simultaneously review the construction of the QSC for the {\rm AdS}_5\times {\rm S}^5 superstring. The resulting description of the spectral problem is arguably much simpler than the starting po...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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74234d4a0dc856ff7d45b723dc18b720345faf74
subsection
277
319
Conclusions and future work
This is very similar to the usual description of energies in quantum-integrable models using Bethe equations: the equations are well-behaved, but finding explicit solutions might not be easy.
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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88ad60b3917fd991010183597d24a243e2907236
subsection
278
319
Future directions
Now that we have derived the \eta -deformed QSC there is a whole host of possible further directions of study.
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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48a9d7b908548bff796dd0e8b877ef36fab7ba1b
subsection
279
319
Finding deformed string energies.
Of course, the prime usage of the deformed QSC is the computation of string energies for the \eta -deformed string theory. The spectrum of the deformed theory should interpolate from the undeformed string spectrum to the undeformed mirror theory spectrum, each extreme having a string theory interpretation. The deformat...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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b8a3a60d70bd4c454be5095f65d159f4eb0c00ce
subsection
280
319
Studying thermodynamics.
As mentioned in section , it would also be very interesting to use the trigonometric QSC to look at the thermodynamics of our models, in particular the undeformed string. Here it would be great to understand how to incorporate chemical potentials in the \eta -deformed QSC, analogous to how this was done in the undeform...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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9b421a0b2a22b224a13588990e09f49c9b824730
subsection
281
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Other deformed QSCs.
We saw that the \eta -deformed {\rm AdS}_5\times {\rm S}^5 string “contains” many other integrable deformations of the {\rm AdS}_5\times {\rm S}^5 string, fitting into the class of homogeneous Yang-Baxter deformations , , , , , . Namely, by considering particular coupled infinite boost and q\rightarrow 1 limits, it is ...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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59742a9dcc6ff2faeb677d51ea211c215f4eabdd
subsection
282
319
The root of unity case.
Another interesting direction to investigate is the model defined by the exact q-deformed S-matrix for q a root of unity, i.e. q=e^{i \pi /k}, instead of real. The representation theory of quantum algebras is quite different when q is a root of unity, which will presumably reflect itself in the QSC – as it does in the ...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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1bc9aaf2f8140b515914d222992b8384e82fc7ed
subsection
283
319
Elliptic QSC.
Finally, even more speculatively, one might wonder whether it is possible to find an elliptic deformation of the {\rm AdS}_5\times {\rm S}^5 string, or at least its exact S-matrix. The resulting theory should constitute the “xyz" cousin of the {\rm AdS}_5\times {\rm S}^5 (xxx) and \eta -deformed (xxz) string theories, ...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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def5db9c870938d4e6615813c8dfbf7fd3ec9aee
subsection
284
319
Characterisation
The x functions are solutions to the shortening condition for the fundamental representations of the manifest symmetry algebra of the S matrix, \mathfrak {psu}_q(2|2)^{\otimes 2} (with q=1 for the undeformed case) when viewed as a functional equation: the deformed shortening condition ise^{iu} = \frac{x(u) + \frac{1}{x...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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53de8f75832b1a553da6f4fb847e01fa32825506
subsection
285
319
Characterisation
Finally, just like in our discussion about analytic continuation in section REF the two solutions x(u) and 1/x(u) are related by analytic continuation.We can characterise the solutions of the shortening condition that we find most convenient uniquely by the following set of properties:it has a short or long cut between...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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77f149350fbdda249005535bb3963fe52e9b55c3
subsection
286
319
Conjugation.
The undeformed x-functions are both real analytic and as such conjugation of these functions is simple: for both x_s and x_m we find\overline{x^{\text{und}}(u)} = x^{\text{und}}\left(\overline{u}\right).The deformed case is more complicated:\overline{x_s(u)} = \frac{x_s\left( \overline{u}\right)+\xi }{x_s\left( \overli...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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095e2e3e94f0e93613bba71e88245fd039069ef0
subsection
287
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Continuation.
By construction both sets of x functions coincide on the lower half-plane and are inverse on the upper half-plane, following the lower-half-plane conventions. Following the definition of the tilde continuation this implies that in both cases\widetilde{x^{\text{und}}(u)} = \frac{1}{x^{\text{und}}\left(u\right)}, \qquad ...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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43711d94b083e1243005977e91e08ab608a35b43
subsection
288
319
Commutativity of conjugation and continuation.
An interesting and non-trivial property that survives deformation is the fact that conjugation and continuation using the tilde of the x functions commutes. In the undeformed case this is quite trivial, as\widetilde{\overline{x^{\text{und}}(u)}} = \widetilde{x^{\text{und}}\left(\overline{u}\right)} = \frac{1}{x^{\text{...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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9cb6dd2b6c2650ac78ed52d1002631e7f2e28909
subsection
289
319
Deformed kernels
The kernels that appear in the \eta -deformed TBA-equations (REF ) are defined as follows:K_M (u) = \frac{1}{2\pi i} \frac{d}{du} \log S_M(u) = \frac{1}{2\pi } \frac{ \sinh Mc}{\cosh Mc- \cos u},withS_{Q}(u) = \frac{S^{[-Q]}}{S^{[+Q]}} = \frac{\sin \frac{1}{2} (u-i Q c)}{\sin \frac{1}{2} (u+i Q c)},using our definition...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
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Physics
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d0fb1f5631e723cf2b302221c0192fbf6aa3fb3e
subsection
290
319
Deformed kernels
They are given byK_{xv}^{QM}(u,v) &=& \frac{1}{2\pi i} \frac{d}{du} \log S_{xv}^{QM} (u,v), \\ K_{vwx}^{MQ}(u,v) &=& -\frac{1}{2\pi i} \frac{d}{du} \log S_{xv}^{QM} (v,u), \\ K_{\beta }^{Qy}(u,v) &=& \frac{1}{2\pi i} \frac{d}{du} \log S_{\beta }^{Qy} (u,v), \\ K_{\beta }^{yQ}(u,v) &=& \beta \frac{1}{2\pi i} \frac{d}{du...
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1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
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Physics
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f1a4b1072025def9d4537c50cbf550241e68ef85
subsection
291
319
Deformed kernels
We effectively go back to the |q|=1 conventions in our definition of K^{\Sigma }_{QM} below, to get kernels and TBA equations analogous to the undeformed model.-i\log \Sigma ^{QM}(y_1,y_2) =& \, \Phi (y_1^+,y_2^+)-\Phi (y_1^+,y_2^-)-\Phi (y_1^-,y_2^+)+\Phi (y_1^-,y_2^-) \\ &\, -\frac{1}{2}\left(\Psi (y_1^+,y_2^+)+\Psi ...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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a5607f55c3d59befb5fa6faf00e30fc2b624bd92
subsection
292
319
Deformed kernels
These expressions are necessary to derive the simplified expression for the dressing phase contribution to the simplified TBA-equations, as discussed in appendix .Some important identities for the kernels areK_{Qy}(u,v) &:=& K_{-}^{Qy}(u,v)-K_{+}^{Qy}(u,v) = K(u+ i Q c,v) -K(u- i Qc,v) \\ K_{yQ}(u,v) &:=& K_{-}^{yQ}(u,...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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0e6c27cd1cfbd083e994ba235a63da7e6930a1e1
subsection
293
319
Undeformed quantities.
After letting q\rightarrow 1, taking x= x^{\text{und}}_m (defined in (REF )) and replacing the shift distance c\rightarrow 1/g the kernels defined above are the undeformed TBA-kernels. In particular this means we use S^{\text{und}} instead of S. The undeformed mirror energy and momentum are given by\tilde{p}_{\text{und...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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aa2ebf2a08795af8d6ee14ed234f017432d531af
subsection
294
319
Dressing-phase simplification
An important role in the derivation of the analytic Y-system from the TBA equations is played by the dressing-phase kernel K_{\mathfrak {sl}(2)}^{PQ}. Its explicit form is very convoluted, making its analysis tricky. In order to derive the analytic Y-system we need to know the discontinuities that arise because of the ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 511, "openalex_id": "", "raw": "A. Cavagli`a, D. Fioravanti and R. Tateo, “Extended Y-system for the AdS_5/CFT_4 correspondence”, Nucl.Phys. B843, 302 (2011), arxiv:1005.3016.", "source_ref_id": "ed7f9a203b2f38f3ce07ed3c8c3d...
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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76edae93255a0ce9a08f9d6eb871762e678a625a
subsection
295
319
Dressing-phase simplification
There are no particular subtleties in taking the \epsilon \rightarrow 0 limit and direct evaluation gives-i \log \hat{\Sigma }_Q = & \, \Phi (y_1^-,x)- \Phi (y_1^-,1/x)- \Phi (y_1^+,x)+ \Phi (y_1^+,1/x)\\ & \, + \frac{1}{2} \left( \Psi (y_1^-,x)- \Psi (y_1^-,1/x)+ \Psi (y_1^+,x)- \Psi (y_1^+,1/x)\right)\\ &\, + \Psi (x...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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1ee377194fd2b39ca2f4d61e4c783a73fc277eac
subsection
296
319
Dressing-phase simplification
We recognise this combination of x functions as\frac{\partial }{\partial t} \log S(s,t), \qquad S(s,t) = \frac{x(s)-x(t)}{x(s)-1/x(t)},such that, with v=u(y),\oint _{\mathcal {C}} \frac{dz}{2 \pi i} \frac{1}{z-y} f(z) = -\int _{\hat{Z}_0} \frac{dt}{2\pi i} \left(\frac{\partial }{\partial t} \log S(v,t)\right) f(x(t)).W...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1495, "openalex_id": "", "raw": "G. Arutyunov and S. Frolov, “Simplified TBA equations of the {\\rm AdS}_5\\times {\\rm S}^5 mirror model”, JHEP 0911, 019 (2009), arxiv:0907.2647.", "source_ref_id": "7a5c687d358e8fd835810b86...
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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9a2ceb98ae7b5f729d56890c24d1de65aa1737bf
subsection
297
319
Dressing-phase simplification
Integrating by parts in the t_1 integral, noting that K_{Qy} vanishes at \pm \theta , and taking out factors of 2 \pi i to define kernels, we end up with\frac{1}{2\pi }\frac{\partial }{\partial u} \Delta \Phi = 2 K_{Qy} \,\hat{\star }\, K_{q\Gamma }^{[2]} \,\hat{\star }\, \bar{K},where K_{q\Gamma }^{[Q]}(u) = \tfrac{1}...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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d79b623be1d9d59fee07b923da88999d380929e4
subsection
298
319
Dressing-phase simplification
By the same propertyS^{[Q+2]}_{q\Gamma }(u,t) =S^{[Q]}_{q\Gamma }(u,t)/(e^{i(u-t)}S_Q(u-t))We hence find\frac{1}{2\pi } \frac{\partial }{\partial u} \Delta \Psi = (2 K_{q\Gamma }^{[Q]}-K_Q)\, \hat{\star }\,\bar{K} + \frac{Q-2}{2\pi } \star \bar{K}.The next line gives, upon integration by parts again\frac{1}{2\pi } \fra...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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7692bf474407c7c0788fd0a00c590f0b040e784e
subsection
299
319
Dressing-phase simplification
Note that this expression is manifestly compatible with the relation K^{[Q+2]}_{q\Gamma } = K^{[Q]}_{q\Gamma } - K_Q -1 encountered above. Using these identities we can finally simplify \hat{K}_Q^\Sigma to\hat{K}_Q^\Sigma & \, = \sum _{N=1}^{\infty } \left(K_{Qy}\,\hat{\star }\, \bar{K}_{2N} + \bar{K}_{Q+2N}\right).
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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06a84312fb9f4971cce837d7ccb8de35ffc39f26
subsection
300
319
Contribution in the TBA.
The contribution of the improved mirror dressing factor to \Delta appearing in the TBA equations is given by\Delta ^\Sigma (u) = 2 \sum _Q L_Q \star \hat{K}^\Sigma _Q (u).This function has a short cut on the real line. We would like to continue it from the upper half-plane to have long cuts. Using the simplified expres...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 846, "openalex_id": "", "raw": "A. Cavagli`a, D. Fioravanti and R. Tateo, “Extended Y-system for the AdS_5/CFT_4 correspondence”, Nucl.Phys. B843, 302 (2011), arxiv:1005.3016.", "source_ref_id": "ed7f9a203b2f38f3ce07ed3c8c3d...
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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b431bab5c5262177ae020772475714bff3abf8df
subsection
301
319
Deriving a local discontinuity equation for
We are looking for a local discontinuity equation that we can impose on the Y-system equations instead of the non-local discontinuity (REF ). As an example of how these computations are carried out in practice we show it in detail here. We compute (simultaneously for the deformed and undeformed case)\left[\log \frac{Y_...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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a9f07c4fbdf729fb1a0b3dacd82fd5c56b163d25
subsection
302
319
Deriving the TBA equations for
We present a full derivation of Y_{(v)w} TBA-equations (see section REF in the main text for a summary of this derivation).We can write the left-hand side of the TBA equation as a contour integral as\log Y_{M|(v)w}(u) =\sum _{\tau }\sum _{l=0}^{\infty } \int _{Z_0} \frac{dz}{2\pi i} H(z+2i\tau N c-u) \left[ \log Y_{M|(...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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3db92169ad8f415616c90747343c3239fca01183
subsection
303
319
Deriving the TBA equations for
Applying it once yields& &\left[ \log Y_{M|vw} \right]_{M+2l} = \\ &=& \sum _{N=1}^{\infty } A_{MN} \left[L_{N|vw}\right]_{M+2l -1} + \sum _{N=1}^{\infty } A_{M-1,N} \left[L_{N|vw}\right]_{M-1+2l -1} -\left[ \log Y_{M|vw} \right]_{M+2l-2}\\ &+& \left[\log Y_{M-2|vw}\right]_{M+2l-2} +\left[\log Y_{M|vw}\right]_{M+2(l-1)...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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ab1759da199274741785825b9b774c2542d2ab04
subsection
304
319
Deriving the TBA equations for
Using the line (REF ) with first term \left[ \log Y_{M+1|vw} \right]_{M+2l-1} (So M\rightarrow M+1,l\rightarrow l-1) gives\left[ \log Y_{M+1|vw} \right]_{M+2l-1} = \left[\log Y_{M+2|vw}\right]_{M+2l-2} +\sum _{Q=2}^{M+1} \sum _{N=1}^{\infty } A_{QN} \left[L_{N|vw}\right]_{Q+2l -3}\\+ \left[\log Y_{1|vw}\right]_{2l-1}-\...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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a3b906ef7bb4b4e2da487bda7266bb7e3d35a0c3
subsection
305
319
Deriving the TBA equations for
The triple sum can be put in a more suggestive form:& &\sum _{J=0}^l\sum _{Q=1+J}^{M+J} \sum _{N=1}^{\infty } A_{QN} \left[L_{N|vw}\right]_{Q+2l -1-2J} \\&=& \sum _{J=1}^l\sum _{Q=1+J}^{M+J} \left( \left[L_{Q+1|vw}\right]_{Q+2l -1-2J}+\left[L_{Q-1|vw}\right]_{Q+2l -1-2J}\right)+ \sum _{Q=1}^{M} \sum _{N=1}^{\infty } A_...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1857, "openalex_id": "", "raw": "A. Cavagli`a, D. Fioravanti and R. Tateo, “Extended Y-system for the AdS_5/CFT_4 correspondence”, Nucl.Phys. B843, 302 (2011), arxiv:1005.3016.", "source_ref_id": "ed7f9a203b2f38f3ce07ed3c8c3...
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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6d8489b10c21652dd6e519a33b87f578fa54d01d
subsection
306
319
Deriving the TBA equations for
REF and fig. respectively, we can rewrite this expression for Y_-'s as\left(\Lambda _--\Lambda _+\right) \hat{\star } K_M.[Figure: The contour \gamma _0 in the undeformed (a) and in the deformed (b) case. The dotted line indicates that the lower half of the contour runs on the second sheet.]Collecting all the remaining...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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921d6fa4fa35cb7ad534485ffda0f6f12b0862f2
subsection
307
319
Deriving the TBA equations for
\sum _{Q=1+l}^{M+l} \Lambda _Q(z+\tau Qci)\right).These terms excluding the \Lambda _Q terms in the last line together form the K_{PQ} kernel:&+& \sum _{Q=1}^{M-1} L_{Q|vw}\star K_{M-Q}- \sum _{\tau }\sum _{l=1}^{\infty }\tau \int _{Z_0 -i\tau \epsilon }H(z+\tau (M+2l)ci-u)\cdot \\& &\qquad \left(L_{l|vw}(z+\tau li c)+...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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556acd81ec68e84efa6ba27b4975e56fd3412744
subsection
308
319
Deriving the TBA equations for
Our total right-hand side for the the TBA-equation of Y_{M|vw} now reads\sum _{N=1}^{\infty } L_{N|vw} \star K_{NM} + \left(\Lambda _--\Lambda _+\right) \hat{\star } K_M-\sum _{Q=1}^{\infty } \sum _{l=\max (M-Q,0)}^{M-1} \Lambda _{Q+1}\star K_{Q+1+2l-M}.Rewriting the \Lambda _{\beta }'s into L_{\beta }'s and using the ...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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81268cecfeac03b9c05219e047a7db4ac731f485
subsection
309
319
Deriving discontinuities for
For the derivation of the Y_Q TBA-equation in section from the analytic Y-system we need to derive discontinuities of the form\left[ \log Y_{M} \right]_{\pm (2M+l)},where M,l\in \mathbb {N}. We will derive them from the Y-system in a spirit very similar to the corresponding derivation in the Y_{(v)w} case.This means in...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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42d4ea5a95cdfcfb61049c5444978c3c99a2bb62
subsection
310
319
Deriving discontinuities for
Taking discontinuity brackets at M+2l-1 for M\ge 2 leads to\left[ \log Y_{M} \right]_{M+2l} &=& -\sum _{N=1}^{\infty } A_{MN} \left[L_{N}\right]_{M+2l -1} + \left[L_{vw|M-1}^{(\alpha )}\right]_{M+2l -1} - \left[ \log Y_{M} \right]_{M+2l-2} \\ &=& -\sum _{N=1}^{\infty } A_{MN} \left[\Lambda _{N}\right]_{M+2l -1} + \left...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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4924bfb1d4615d6e738f47f962ab0f13a4ace86a
subsection
311
319
Deriving discontinuities for
When combining the statements, these terms will cancel. We can repeatedly do this to end up with& &\left[ \log Y_{M} \right]_{M+2l} = \left[ \log Y_{M+l+1} \right]_{M+l-1} +\sum _{J=1}^{l+1}\sum _{Q=J}^{M+J-2} \left[L_{vw|Q}^{(\alpha )}\right]_{Q+2l-2J+2} \\&-&\sum _{J=0}^l\sum _{Q=1+J}^{M+J} \sum _{N=1}^{\infty } A_{Q...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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d95d6bdd0e4d5c9684248879c6a2b14a3bd59a21
subsection
312
319
Deriving discontinuities for
We find that, while being careful about the implications of changing M+2l\rightarrow \pm (M+2L),\left[ \log Y_{M} \right]_{M+2l} &= \sum _{J=1}^{l+1}\sum _{Q=1+J}^{M+J-1} \left[L_{vw|Q-1}^{(\alpha )}\right]_{Q+2l-2J+1} \\&-\sum _{J=0}^l\sum _{Q=1+J}^{M+J} \sum _{N=1}^{\infty } A_{QN} \left[\Lambda _{N}\right]_{Q+2l -1-...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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