Crossing the phantom divide with a classical Dirac field

Details Crossing the phantom divide with a classical Dirac field Crossing the phantom divide with a classical Dirac field

2010-12-31

arxiv.org/abs/1101.0281v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted for publication in Astrophysics & Space Science, 10 pages, 6 figures

Scientific paper

In this paper we consider a spatially flat Friedmann-Robertson-Walker (FRW) cosmological model with cosmological constant, containing a stiff fluid and a classical Dirac field. The proposed cosmological scenario describes the evolution of effective dark matter and dark energy components reproducing, with the help of that effective multifluid configuration, the quintessential behavior. We find the value of the scale factor where the effective dark energy component crosses the phantom divide. The model we introduce, which can be considered as a modified $\Lambda$CDM one, is characterized by a set of parameters which may be constrained by the astrophysical observations available up to date.

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