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Collisional equilibrium, particle production and the inflationary universe

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arxiv gr-qc/9608038 v1 pith:JRNDVN7Y submitted 1996-08-16 gr-qc astro-ph

Winfried Zimdahl , Josep Triginer , Diego Pavon This is my paper · ORCID
classification gr-qcastro-ph
keywords equilibriumparticleparticlescreationinflationmatterproductionrate
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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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Cited by 3 Pith papers

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  1. Eckart heat-flux applicability in $F(\Phi,X)R$ theories and the existence of temperature gradients

    gr-qc 2025-12 unverdicted novelty 7.0 of 10

    Eckart heat flux holds for all timelike scalar configurations in F(Φ,X)R + G theories if and only if F_X ≡ 0, reducing the theory to a Jordan-like subclass of Horndeski.

  2. Cosmological Stealth fields and Non-Equilibrium thermodynamics

    gr-qc 2026-06 unverdicted novelty 5.0 of 10

    Stealth scalar fields in dissipative FLRW cosmology obey a generalized Riccati equation with dissipative pressure as driving term, admitting a stable entropy-selected attractor and an unstable repeller that track non-...

  3. Forces parallel to particle trajectories in relativistic gravity

    gr-qc 2025-07 reject novelty 2.0 of 10

    A pedagogical note claims that parallel forces in cosmology and scalar-tensor gravity can be reparametrized away, but its claim that such forces occur generally in Einstein frame scalar-tensor gravity relies on an inv...

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