Unified Model for Dark Energy
Abstract
Description
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 $ω\geq -1$, 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.
5 pages, some misprints corrected, a comment on the initial equation of state inserted, one reference added
5 pages, some misprints corrected, a comment on the initial equation of state inserted, one reference added