Anisotropic Bianchi Type V Model with Variable $$\boldsymbol{\Lambda}$$ and $$\boldsymbol{G}$$: Cosmological Aspects and Singularity Analysis

We consider an anisotropic space-time model and explore the universe evolution using analytical solutions of directional scale factors. In the Bianchi type V space-time framework, a new set of exact solutions of Einstein’s field equations with dynamical gravitational and cosmological constants have been obtained. The time-dependent expansion scalar is used to illustrate the observational compatibility with the Cosmic chronometer data. The cosmographic parameters are studied using the best-fit parameter values. The model yields a consistent evolution as compared to the $$\Lambda$$ –cold dark matter model at low redshift. Further, we study the existence of finite-time singularities in the anisotropic space-time. The universe evolution with the linear equation of state has been probed for different aspects, such as the behavior of physical parameters and dissipation of anisotropy. The model may explain the accelerating universe expansion with vanishing anisotropy at late times.

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Publication Details

Journal
Gravitation and Cosmology
Published
2025-09-01
DOI
https://doi.org/10.1134/s0202289325700227
Primary Topic
Cosmology and Gravitation Theories
Type
article
Field-Weighted Citation Impact
0.00
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article

Anisotropic Bianchi Type V Model with Variable $$\boldsymbol{\Lambda}$$ and $$\boldsymbol{G}$$: Cosmological Aspects and Singularity Analysis

S. Kotambkar, G. P. Singh, Prerna Parkhi
Gravitation and Cosmology
Cosmology and Gravitation Theories
article

Anisotropic Bianchi Type V Model with Variable $$\boldsymbol{\Lambda}$$ and $$\boldsymbol{G}$$: Cosmological Aspects and Singularity Analysis

S. Kotambkar, G. P. Singh, Prerna Parkhi
article en

Abstract

We consider an anisotropic space-time model and explore the universe evolution using analytical solutions of directional scale factors. In the Bianchi type V space-time framework, a new set of exact solutions of Einstein’s field equations with dynamical gravitational and cosmological constants have been obtained. The time-dependent expansion scalar is used to illustrate the observational compatibility with the Cosmic chronometer data. The cosmographic parameters are studied using the best-fit parameter values. The model yields a consistent evolution as compared to the $$\Lambda$$ –cold dark matter model at low redshift. Further, we study the existence of finite-time singularities in the anisotropic space-time. The universe evolution with the linear equation of state has been probed for different aspects, such as the behavior of physical parameters and dissipation of anisotropy. The model may explain the accelerating universe expansion with vanishing anisotropy at late times.

Gravitation and CosmologyVol. 31(3)
Rashtrasant Tukadoji Maharaj Nagpur University (IN), Visvesvaraya National Institute of Technology (IN), Government Medical College (IN), Gujarat Technological University (IN)
Openalex Percentile: Top 84%
Cosmology and Gravitation Theories
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