Generalized Rastall's gravity and its effects on compact objects

Abstract

We present a generalization of Rastall's gravity in which the conservation law of the energy-momentum tensor is altered, and as a result, the trace of the energy-momentum tensor is taken into account together with the Ricci scalar in the expression for the covariant derivative. Afterwards, we obtain the field equations in this theory and solve them by considering a spherically symmetric space-time. We show that the external solution has two possible classes of solutions with spherical symmetry in the vacuum in generalized Rastall's gravity, and we analyse one of them explicitly. The generalization, in contrast to constant value $k=8\pi G$ in general relativity, has a gravitational parameter $k$ that depends on the Rastall constant $\alpha$. As an application, we perform a careful analysis of the effects of the theory on neutron stars using realistic equations of state (EoS) as input. Our results show that important differences on the profile of neutron stars are obtained within two representatives EoS.

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• Compact stars in Rastall gravity: hydrostatic equilibrium and radial pulsations
• Charged gravastar model in Rastall theory of gravity
• Quasinormal modes, temperatures and greybody factors of black holes in a generalized Rastall gravity theory
• Black hole solutions surrounded by anisotropic fluid in f(T,T) gravity
• Modeling Gravastar Structure admitting Kuchowicz Spacetime in Rastall Gravity Theory