Unified Model for Dark Energy

Details Unified Model for Dark Energy Unified Model for Dark Energy

2002-12-18

arxiv.org/abs/astro-ph/0212414v2

Phys.Lett.B562:1-8,2003

Astronomy and Astrophysics

Astrophysics

5 pages, some misprints corrected, a comment on the initial equation of state inserted, one reference added

Scientific paper

10.1016/S0370-2693(03)00540-9

A new model for the universe filled with a generalized Chaplygin fluid is considered which unitarily describes as a single vacuum entity both a quintessence scalar field and a cosmological constant, so unifying the notion of dark energy. While the evolution of the universe filled with such a fluid does not obviously contradict the present cosmic acceleration, the introduced single dark-energy component, for equations of state with characteristic parameter $\omega\geq -1$, behaves like an usual quintessence fluid with constant equation of state at early high densities, and like a pure cosmological constant at late cosmological times.

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