Black Hole Thermodynamics in MOdified Gravity (MOG)
arXiv:1504.08226 · doi:10.1016/j.physletb.2016.04.041
Abstract
We analyze the thermodynamical properties of black holes in a modified theory of gravity, which was initially proposed to obtain correct dynamics of galaxies and galaxy clusters without dark matter. The thermodynamics of non-rotating and rotating black hole solutions resembles similar solutions in Einstein-Maxwell theory with the electric charge being replaced by a new mass dependent gravitational charge . This new mass dependent charge modifies the effective Newtonian constant from to , and this in turn critically affects the thermodynamics of the black holes. We also investigate the thermodynamics of regular solutions, and explore the limiting case when no horizons forms. So, it is possible that the modified gravity can lead to the absence of black hole horizons in our universe. Finally, we analyze corrections to the thermodynamics of a non-rotating black hole and obtain the usual logarithmic correction term.
Title changed slightly; new section on BH entropy corrections added; matches version published in PLB
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