TY - JOUR
T1 - Cosmological volume acceleration in dust epoch
T2 - using scaling solutions and variable cosmological term Λ (t) within an anisotropic cosmological model
AU - Socorro, J.
AU - Pérez-Payán, S.
AU - Espinoza-García, Abraham
AU - Díaz-Barrón, Luis Rey
N1 - Publisher Copyright:
© 2020, Springer Nature B.V.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - 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).
AB - 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).
KW - Acceleration in dust epoch
KW - Anisotropic cosmological model
KW - Exact solution
KW - Variable cosmological term
UR - http://www.scopus.com/inward/record.url?scp=85085965089&partnerID=8YFLogxK
U2 - 10.1007/s10509-020-03810-9
DO - 10.1007/s10509-020-03810-9
M3 - Artículo
SN - 0004-640X
VL - 365
JO - Astrophysics and Space Science
JF - Astrophysics and Space Science
IS - 6
M1 - 93
ER -