期刊
ASTROPHYSICS AND SPACE SCIENCE
卷 365, 期 6, 页码 -出版社
SPRINGER
DOI: 10.1007/s10509-020-03810-9
关键词
Exact solution; Acceleration in dust epoch; Variable cosmological term; Anisotropic cosmological model
资金
- PROMEP grants UGTO-CA-3
- SNI-CONACYT
Under the premise that the current observations of the cosmic microwave background radiation set a very stringent limit to the anisotropy of the universe, we consider an anisotropic model in the presence of a barotropic perfect fluid and a homogeneous scalar field, which transits to a flat FRW cosmology for late times in a dust epoch, presenting an accelerated volume expansion. Furthermore, the scalar field is identified with a varying cosmological term via V (phi(t)) = 2 Lambda(t). Exact solutions to the EKG system are obtained by proposing an anisotropic extension of the scaling solutions scenario:. rho similar to eta(-n), rho(phi) similar to eta(-m-), with eta(3) = a(1)a(2)a(3) the volume function of the anisotropic model (a(1), a(2), a(3) being the scale factors).
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