Bianchi type-I string cosmological models in bimetric theory of gravitation

Rao, V. U. M.; Vinutha, T.; Sireesha, K. V. S.

doi:10.1007/s10509-008-9867-7

Cited by 11 publications

(6 citation statements)

References 31 publications

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“…The Bianchi I geometry has been studied in several contexts beyond general relativity [19][20][21][22][23]. Such a geometry generalizes the flat Friedmann-Lemaître-Robertson-Walker (FLRW) adopted in the standard model.…”

Section: Introductionmentioning

confidence: 99%

Bumblebee field as a source of cosmological anisotropies

Maluf,

Neves

2021

Preprint

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In this work, a bumblebee field is adopted in order to generate cosmological anisotropies. For that purpose, we assume a Bianchi I cosmology, as the background geometry, and a bumblebee field coupled to it. Bumblebee models are examples of a mechanism for the Lorentz symmetry violation by assuming a nonzero vacuum expectation value for the bumblebee field. When coupled to the Bianchi I geometry, which is not in agreement with a cosmological principle, the bumblebee field plays the role of a source of anisotropies and produces a preferred axis. Thus, a fraction of the cosmic anisotropies would come from the Lorentz symmetry violation. In the last part of the article, we try to assume an upper bound on the bumblebee field using the quadrupole and octopole moments of the cosmic microwave background radiation.

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Section: Introductionmentioning

confidence: 99%

Bumblebee field as a source of cosmological anisotropies

Maluf,

Neves

2021

Preprint

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“…Singh et al [16] have investigated the variation law for Hubble's parameter in a homogeneous and anisotropic Bianchi type-V space time model that yield a constant value of deceleration parameter. Bianchi type-V cosmological models with negative deceleration parameter in scalar tensor theories have been presented by Rao et al [17][18][19]. Very recently, Singh and Baghel [20] have studied the Bianchi type-V model with constant deceleration parameter in general relativity and Ram et al [21] have studied such type of models in Saez-Ballester theory.…”

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confidence: 99%

Bulk Viscous Bianchi Type-V Cosmological Models with Variable Gravitational and Cosmological Constant

Singh

Kale²

2009

Int J Theor Phys

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This paper deals with Bianchi type-V cosmological models of the universe filled with a bulk viscous cosmic fluid in the framework of general relativity. A new class of exact solutions has been obtained by considering various well established power law relations among scale factor, cosmological and gravitational constants and cosmic time. Some physical and geometrical behaviors of the models have also been discussed. It has been found that all the models are in fair agreement of observational results.

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“…Sahoo [27] has shown that the spherically symmetric cosmological model did not exist in Rosen's bimetric theory of gravitation when the source of gravitation was either perfect fluid or massive string whereas the model did exist in scalar meson field. Rao et al [28] have studied Bianchi type-I string cosmological models in bimetric theory of gravitation. Recently, Sahoo [29] has discussed inhomogeneous plane symmetric string cosmological models in bimetric theory of gravitation.…”

Section: S D Katore R S Rane and K S Wankhadementioning

confidence: 99%

Bianchi type-I massive string magnetized barotropic perfect fluid cosmological model in bimetric theory

2011

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Bianchi type-I massive string cosmological model for perfect fluid distribution in the presence of magnetic field is investigated in Rosen's [Gen. Relativ. Gravit. 4, 435 (1973)] bimetric theory of gravitation. To obtain the deterministic model in terms of cosmic time, we have used the condition A = (BC) n , where n is a constant, between the metric potentials. The magnetic field is due to the electric current produced along the x-axis with infinite electrical conductivity. Some physical and geometrical properties of the exhibited model are discussed and studied.

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Bianchi type-I string cosmological models in bimetric theory of gravitation

Cited by 11 publications

References 31 publications

Bumblebee field as a source of cosmological anisotropies

Bumblebee field as a source of cosmological anisotropies

Bulk Viscous Bianchi Type-V Cosmological Models with Variable Gravitational and Cosmological Constant

Bianchi type-I massive string magnetized barotropic perfect fluid cosmological model in bimetric theory

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