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- W2146363048 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." @default.
- W2146363048 created "2016-06-24" @default.
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- W2146363048 date "1996-08-15" @default.
- W2146363048 modified "2023-09-26" @default.
- W2146363048 title "Thermodynamics of decaying vacuum cosmologies" @default.
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- W2146363048 doi "https://doi.org/10.1103/physrevd.54.2571" @default.
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