Bulk Viscosity and Particle Creation in the Inflationary Cosmology

Autor:	Eshaghi, Mehdi, Riazi, Nematollah, Kiasatpour, Ahmad
Rok vydání:	2015
Předmět:	General Relativity and Quantum Cosmology
Druh dokumentu:	Working Paper
Popis:	We study particle creation in the presence of bulk viscosity of cosmic fluid in the early universe within the framework of open thermodynamical systems. Since the first-order theory of non-equilibrium thermodynamics is non-causal and unstable, we try to solve the bulk viscosity equation of the cosmic fluid with particle creation through the full causal theory. By adopting an appropriate function for particle creation rate of "Creation of Cold Dark Matter" model, we obtain analytical solutions which do not suffer from the initial singularity and are in agreement with equivalent solutions of Lambda-CDM model. We constrain the free parameter of particle creation in our model based on recent Planck data. It is also found that the inflationary solution is driven by bulk viscosity with or without particle creation. Comment: 5 pages
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1504.07774 Zobrazit plný text záznamu View this record from Arxiv