Cosmological volume acceleration in dust epoch: using scaling solutions and variable cosmological term Λ (t) within an anisotropic cosmological model

J. Socorro, S. Pérez-Payán, Abraham Espinoza-García, Luis Rey Díaz-Barrón

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Abstract

© 2020, Springer Nature B.V. 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(ϕ(t)) = 2 Λ (t). Exact solutions to the EKG system are obtained by proposing an anisotropic extension of the scaling solutions scenario: ρ∼ η−n, ρϕ∼ η−m, with η3= a1a2a3 the volume function of the anisotropic model (a1, a2, a3 being the scale factors).
Original languageAmerican English
JournalAstrophysics and Space Science
DOIs
StatePublished - 1 Jun 2020

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