Crossing the phantom divide with a classical Dirac field |
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| Authors: | Mauricio Cataldo Luis P Chimento |
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| Institution: | 1.Departamento de Física, Facultad de Ciencias,Universidad del Bío–Bío,Casilla 5-C, Concepción,Chile;2.Departamento de Física, Facultad de Ciencias Exactas y Naturales,Universidad de Buenos Aires,Buenos Aires,Argentina |
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| Abstract: | 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 ΛCDM one, is characterized by a set of parameters which may be constrained
by the astrophysical observations available up to date. |
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