Anisotropic EGB hypersphere with MIT bag model equation of state
Astrophysics and Cosmology Research Unit, School of Mathematics, Statistics and Computer Science, University of KwaZulu–Natal, Private Bag X54001, 4000, Durban, South Africa
Accepted: 29 October 2021
Published online: 13 November 2021
New exact solutions to the field equations in the Einstein–Gauss–Bonnet (EGB)-modified theory of gravity for a 5-dimensional spherically symmetric static anisotropic distribution of a perfect fluid are obtained. The study is novel in two respects. Firstly, there does not appear to be any use of curvature coordinates in the literature when discussing EGB gravity. Secondly, we invoke a generalized MIT bag model equation of state , which does not appear to have been attempted in the context of higher curvature gravity. A thorough physical analysis is carried out on a particular model to test regularity and stability of the gravitational and thermodynamical behaviour of the stellar model. We show that contributions from the higher-order invariants lead to distinctive effects on the physics of the stellar model and defects in the underlying Einstein standard models appear to be corrected through the EGB contributions.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021