Eur. Phys. J. C (2016) 76: 507
https://doi.org/10.1140/epjc/s10052-016-4347-7

Regular Article - Theoretical Physics

Interacting cosmic fluids and phase transitions under a holographic modeling for dark energy

¹ Instituto de Física, Facultad de Ciencias, Pontificia Universidad Católica de Valparaíso, Avenida Brasil, 4950, Valparaiso, Chile
² Departamento de Ciencias Físicas, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, Avenida Francisco Salazar, Casilla 54-D, 01145, Temuco, Chile

^* e-mail: francisco.pena@ufrontera.cl

Received: 14 December 2015
Accepted: 5 September 2016
Published online: 16 September 2016

Abstract

We discuss the consequences of possible sign changes of the Q-function which measures the transfer of energy between dark energy and dark matter. We investigate this scenario from a holographic perspective by modeling dark energy by a linear parametrization and CPL-parametrization of the equation of state (). By imposing the strong constraint of the second law of thermodynamics, we show that the change of sign for Q, due to the cosmic evolution, imply changes in the temperatures of dark energy and dark matter. We also discuss the phase transitions, in the past and future, experienced by dark energy and dark matter (or, equivalently, the sign changes of their heat capacities).