Geodesic
A~Bianchi type-II dark-energy cosmology with a~decaying $\Lambda$-term in the~Brans--Dicke theory of gravity
Teoretičeskaâ i matematičeskaâ fizika, Tome 193 (2017) no. 3, pp. 530-546

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We present a sequence of anisotropic Bianchi type-II dark-energy models in the framework of the Brans–Dicke theory of gravity with a variable equation of state (EoS) parameter and a constant deceleration parameter. We use power-law relations between the scalar field $\phi$ and the scale factor $A$ and between the average Hubble parameter $H$ and the average scale factor $A$ to obtain most of the analytic solutions. The dark-energy EoS parameter $\omega$ and its range admitted by the models agrees well with the most recent observational data. It has been observed that the cosmological constant $\Lambda$ is decreasing with time, which is consistent with recent cosmological observations. We study the dynamical stability and physical features of the models.
Keywords: Bianchi type-II space–time, anisotropic dark energy, Brans–Dicke theory of gravity, equation of state parameter
Mots-clés : $\Lambda$-term. 
@article{TMF_2017_193_3_a11,
     author = {J. K. Singh and N. K. Sharma and A. Beesham},
     title = {A~Bianchi {type-II} dark-energy cosmology with a~decaying $\Lambda$-term in {the~Brans--Dicke} theory of gravity},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {530--546},
     publisher = {mathdoc},
     volume = {193},
     number = {3},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2017_193_3_a11/}
}
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J. K. Singh; N. K. Sharma; A. Beesham. A~Bianchi type-II dark-energy cosmology with a~decaying $\Lambda$-term in the~Brans--Dicke theory of gravity. Teoretičeskaâ i matematičeskaâ fizika, Tome 193 (2017) no. 3, pp. 530-546. http://geodesic.mathdoc.fr/item/TMF_2017_193_3_a11/