arxiv:1502.07033

Barotropic FRW cosmologies with Chiellini damping in comoving time

Published on Mar 16, 2015

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Abstract

The study connects barotropic FRW cosmologies with a non-zero cosmological constant to Chiellini dissipative scale factors via the Ermakov equation, and recovers standard zero-cosmological-constant solutions as special cases.

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For non-zero cosmological constant Lambda, we show that the barotropic FRW cosmologies as worked out in the comoving time lead in the radiation-dominated case to scale factors of identical form as for the Chiellini dissipative scale factors in conformal time obtained recently by us in Phys. Lett. A 379 (2015) 882-887. This is due to the Ermakov equation which is obtained in this case. For zero cosmological constant, several textbook solutions are provided as particular cases of Lambda different from zero.

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