Isotropization of locally rotationally symmetric Bianchi-I universe in f(Q)-gravity

Despite having the somewhat successful description of accelerated cosmology, the early evolution of the universe always challenges mankind. Our promising approach lies in a new class of symmetric teleparallel theory of gravity named f(Q), where the non-metricity scalar Q is responsible for the gravitational interaction, which may resolve some of the issues. To study the early evolution of the universe, we presume an anisotropic locally rotationally symmetric (LRS) Bianchi-I spacetime and derive the motion equations. We discuss the profiles of energy density, equation of state and skewness parameter and observe that our models archive anisotropic spatial geometry in the early phase of the universe with a possible presence of anisotropic fluid and as time goes on, even in the presence of an anisotropic fluid, the universe could approach isotropy due to inflation and the anisotropy of the fluid fades away at the same time.

Automated summary

This study is based on a new theory of gravity and explores the early evolution of the universe. The research finds that the universe exhibits an anisotropic spatial geometry and may contain anisotropic fluid during its early phase. However, as time goes on and due to inflation, the universe tends to become isotropic, leading to the disappearance of anisotropy in the fluid.