2025/01/27 by Sarmah, Pranjal, Goswami, Umananda Dev
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)
paper · doi:10.48550/arxiv.2501.15715
Bianchi type III (BIII) metric is an interesting anisotropic model to study cosmic anisotropy as it has an additional exponential term multiplied by a directional scale factor and recasting the cosmological model as a dynamical system to provide various significant information regarding the evolution, stability of the system, etc. Here in this work, we have considered the BIII metric under the framework of f(R,T) gravity theory and studied the dynamical system analysis for three different models. It is found that the first two models i.e. f(R,T) = αR + βT and f(R,T) = R + 2 f(T) are consistent with standard ΛCDM cosmology but the third one i.e. f(R,T) = (ζ+ η τ T)R have some issue of physical viability. Thus we can remark that some f(R,T) models may not be suitable for studying the evolution of the Universe with an anisotropic background like using BIII metric etc. However, all three models agree with the heteroclinically connected path of radiation, matter, and dark energy dominated phases of the Universe as predicted by standard cosmology.