Effect of finite-temperature quantum fields on the early universe

Details Effect of finite-temperature quantum fields on the early universe Effect of finite-temperature quantum fields on the early universe

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981phlb..103..331h&link_type=abstract

Physics Letters B, Volume 103, Issue 4-5, p. 331-337.

Physics

29

Scientific paper

The finite-temperature effect of a quantized conformally invariant scalar field in a closed Robertson-Walker universe is studied. The general solution is characterized by one parameter ξ = Ta which measures the radiation content of the universe. In the high-temperature limit it reduces to the Fischetti-Hurtle-Hu solution where the universe expands linearly in cosmic time near the singularity. In the low-temperature limit, it reduces to a Starobinsky-de Sitter type solution where the singularity is avoided in an exponential expansion. Several characteristic functional dependences of ξ(t) are used to illustrate possible entropy generating processes. The finite-temperature formalism thus provides a unifying framework for the description of the interplay of vacuum and radiation energy and their combined effect on the state of the early universe.

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