Thermodynamics of Decaying Vacuum Cosmologies

Abstract

The thermodynamic behavior of vacuum decaying cosmologies is investigated within a manifestly covariant formulation. Such a process corresponds to a continuous irreversible energy flow from the vacuum component to the created matter constituents. It is shown that if the specific entropy per particle remains constant during the process, the equilibrium relations are preserved. In particular, if the vacuum decays into photons, the energy density $\rho$ and average number density of photons $n$ scale with the temperature as $\rho \sim T^4$ and $n\sim T^3$. The temperature law is determined and a generalized Planckian type form of the spectrum, which is preserved in the course of the evolution, is also proposed. Some consequences of these results for decaying vacuum FRW type cosmologies as well as for models with ``adiabatic'' photon creation are discussed.

21 pages, uses LATEX

References in corpus (5)

• The Cosmological Constant is Back
• FRW Cosmologies with Adiabatic Matter Creation
• Decaying Vacuum Energy and Deflationary Cosmology in Open and Closed Universes
• A new cosmological constant model
• Cosmology, Thermodynamics and Matter Creation

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