Irreversible Processes and Cosmological Models

Details Irreversible Processes and Cosmological Models Irreversible Processes and Cosmological Models

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005tmgm.meet.2363k&link_type=abstract

In: The Tenth Marcel Grossmann Meeting. Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF),

Physics

Braneworlds, Cosmology

Scientific paper

The evolution of a Universe modeled as a mixture of radiation and dark energy is analyzed by taking into account irreversible processes. The dark energy is regarded either as the quintessence or as the Chaplygin gas. The behavior of the two mixtures with different equations of state for the dark energy are compared. Among other results it is shown that for both models there exists a period of a past deceleration with a present acceleration. Moreover, the energy density of the Chaplygin gas tends to a constant value at earlier times than the energy density of quintessence does whereas the energy density of radiation for both mixtures coincide and decay more rapidly than the energy densities of the Chaplygin gas and of quintessence.

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