Thermodynamics of the vacuum

Details Thermodynamics of the vacuum Thermodynamics of the vacuum

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.122..371d&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 122, no. 2, May 1986, p. 371-386.

Astronomy and Astrophysics

Astrophysics

Kinetic Energy, Thermodynamic Properties, Universe, Vacuum, Evolution (Development), Space-Time Functions

Scientific paper

The fact that the energy-momentum tensor has nonzero vacuum expectation value in some space-times (the so-called back reaction) indicates a nontrivial thermodynamics of such vacua. A consequent thermodynamic analysis of the problem in Robertson-Walker space-times shows that, in the generic case, the number of the independent extensives is 2, in spite of the fact that the energy density is completely determined by the time-evolution of the geometry since the preparation of the vacuum state. The appearance of a second independent extensive seems to be in direct connection with the extra entropy term in the Generalized Second Law of Bekenstein and Hawking.

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