Cosmic Evolution of the Kantowski-Sachs Universe in the Context of a Bulk Viscous String in Teleparallel Gravity

被引:1
作者
Bhoyar, S. R. [1 ]
Ingole, Yash B. [1 ]
机构
[1] Phulsing Naik Mahavidyalaya Pusad, Dept Math, Yavatmal 445216, India
关键词
Kantowski-Sachs universe; Bulk viscous string; Hybrid expansion law; f(T) gravity; COSMOLOGICAL MODELS; ELECTROMAGNETIC-FIELDS; ACCELERATING UNIVERSE; VISCOSITY; CONSTANT; FLUID;
D O I
10.1007/s12648-024-03405-y
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
In the present work, we analyzed the Kantowski-Sachs cosmological model along with teleparallel gravity, where a bulk viscous fluid containing one-dimensional cosmic strings serves as the source for the energy-momentum tensor. To obtain the deterministic solution of the field equations, we employed the proportionality condition linking the shear scalar (sigma) and the expansion scalar (theta), establishing a relationship between metric potentials. Another approach employed is the utilization of the hybrid expansion law (HEL). The discussion focuses on the behavior of the accelerating universe concerning the specific choice of a nonlinear (or power law model) of teleparallel gravity f(T)=alpha T+beta T-m, where T is the torsion scalar, alpha , and beta are model parameters and m is restricted to greater than or equal to 2. The effective equation of the state parameter (omega eff) of models support the acceleration of the universe. We observed that the null energy condition and weak energy condition are obeyed but violate the strong energy condition as per the present accelerating expansion. Under specific model parameter constraints, the universe shows a transition from a decelerating to an accelerating phase.
引用
收藏
页码:1589 / 1601
页数:13
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