Gravitational Collapse in Rastall Gravity

Abstract

We study spherically symmetric gravitational collapse of a homogeneous perfect fluid in Rastall gravity. Considering a linear equation of state (EoS) for the fluid profiles, we examine the conditions under which the collapse scenario could end in a spacetime singularity. Depending on the model parameters, the singularity could be either naked or covered by a horizon. We find that a non-vanishing Rastall parameter could affect the formation of apparent horizon so that, naked singularities may form for those values of EoS parameter for which a homogeneous perfect fluid collapse in general relativity (GR) terminates at the black hole formation. Hence the visibility of the resulting singularity depends on the Rastall parameter. The solutions we obtain respect the weak energy condition (WEC) which is crucial for physical validity of the model.

6 pages and 1 figure

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• Qualitative study of anisotropic Rastall cosmologies
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• Compact stars in Rastall gravity: hydrostatic equilibrium and radial pulsations
• Shadow, absorption and Hawking radiation of a Schwarzschild black hole surrounded by a cloud of strings in Rastall gravity
• Quasinormal modes, temperatures and greybody factors of black holes in a generalized Rastall gravity theory
• Null Fluid collapse in Rastall theory of gravity
• Effects of Rastall parameter on perturbation of dark sectors of the Universe
• Gravitational Collapse without Singularity Formation in Brans-Dicke Theory
• Lemaitre-Tolman-Bondi Static Universe in Rastall-like Gravity
• Non-Singular Collapse Scenario From Matter-Curvature Coupling
• Generalized Misner-Sharp energy in the generalized Rastall theory
• Thermodynamic features of AdS black holes within the Rastall gravity and perfect fluid matter framework
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