For a radiating spherical star in f(R,T)=R+2λT gravity with a generalized Vaidya exterior, the paper derives matching conditions and expressions for singularity and apparent-horizon formation times, then maps parameter regions where a black hole forms.
Black hole thermodynamics in modified gravity
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abstract
The theory of general relativity is often considered under the framework of modified Einstein gravity to explain different phenomena under strong curvature. The strong curvature effect plays a main role near black holes, where the gravitational field is strongest. The idea of black hole thermodynamics is to describe the strong field curvature properties of a black hole in the effective thermodynamical framework, e.g. entropy, temperature, heat capacity etc. In this paper, our aim is to explore how the effect of modified gravity changes the thermodynamic properties of black hole. We show that even a small modification to Einstein gravity affects the thermodynamical properties of a black hole.
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Formation of Singularity and Apparent Horizon for Dissipative Collapse in $f(R,T)$ Theory of Gravity
For a radiating spherical star in f(R,T)=R+2λT gravity with a generalized Vaidya exterior, the paper derives matching conditions and expressions for singularity and apparent-horizon formation times, then maps parameter regions where a black hole forms.