Collisional equilibrium, particle production and the inflationary universe

Details Collisional equilibrium, particle production and the inflationary universe Collisional equilibrium, particle production and the inflationary universe

1996-08-16

arxiv.org/abs/gr-qc/9608038v1

Phys.Rev. D54 (1996) 6101-6110

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages, latex, no figures, to appear in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.54.6101

Particle production processes in the expanding universe are described within a simple kinetic model. The equilibrium conditions for a Maxwell-Boltzmann gas with variable particle number are investigated. We find that radiation and nonrelativistic matter may be in equilibrium at the same temperature provided the matter particles are created at a rate that is half the expansion rate. Using the fact that the creation of particles is dynamically equivalent to a nonvanishing bulk pressure we calculate the backreaction of this process on the cosmological dynamics. It turns out that the `adiabatic' creation of massive particles with an equilibrium distribution for the latter necessarily implies power-law inflation. Exponential inflation in this context is shown to become inconsistent with the second law of thermodynamics after a time interval of the order of the Hubble time.

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