Bulk Viscosity and Particle Creation in the Inflationary Cosmology

Abstract

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.

arXiv comment5 pages

References in corpus (13)

• The QCD Equation of State with almost Physical Quark Masses
• Universal properties of bulk viscosity near the QCD phase transition
• Cosmic anti-friction and accelerated expansion
• FRW Cosmologies with Adiabatic Matter Creation
• Bulk Viscous Cosmology
• Accelerating Cold Dark Matter Cosmology (${\Omega }_{\Lambda }\equiv 0$)
• CDM Accelerating Cosmology as an Alternative to LCDM model
• An Accelerating Cosmology Without Dark Energy
• Cosmological particle production, causal thermodynamics, and inflationary expansion
• Is Emergent Universe a Consequence of Particle Creation Process?
• Dissipative Fluid in Brans Dicke theory and late time acceleration
• Qualitative Viscous Cosmology
• Flat FRW Cosmologies with Adiabatic Matter Creation: Kinematic tests