Work

Stability of relativistic spheres powered by energy profile in Einstein Gauss–Bonnet gravity

Year: 2025

Type: article

Abstract: In this paper, we study the dynamical irregularity of the locally anisotropic spherical fluids in the context of Einstein–Gauss–Bonnet theory. We aim to describe the causes of energy-density irregularity of self-gravitating fluids and explain how those causes evolved from a homogeneous distribution at first. After computing field equations, we formulate two independent components of evolution equations. This expression involves the Weyl tensor and dynamical variables that would lead us to explain the emergence of inhomogeneity patterns. The relevant quantities involved in the irregularities within the initially homogeneous system are analyzed by considering particular nondissipative and dissipative distribution cases. We find the theoretical irregularity factor consistent with astrophysical observations. With this relation, it is explicitly demonstrated that in the presence of Einstein–Gauss–Bonnet gravity terms, the inhomogeneity term decreases its role gradually as the observer moves away from the center towards the boundary surface.

Source: International Journal of Modern Physics D

DOI: 10.1142/s0218271825500361

Authors: Z. Yousaf, Kazuharu Bamba, Mansoor Alshehri, A. Farhat

Institutions: University of the Punjab, Fukushima University, King Saud University

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: King Saud University, Japan Society for the Promotion of Science

Awards: G3312219301, Unified origins of cosmic accelerated expansion, three cosmic compositions, large-scale magnetic fields and primordial gravitational waves in extended gravitational theories, G6573183265, Theoretical study and observational constraints on cosmology beyond the standard cosmological model