For charges held near a gravastar, the self-force carries information about the interior, giving explicitly computable differences from the black-hole case.
Electrostatics in a Schwarzschild black hole pierced by a cosmic string
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We explicitly determine the expression of the electrostatic potential generated by a point charge at rest in the Schwarzschild black hole pierced by a cosmic string. We can then calculate the electrostatic self-energy. From this, we find again the upper entropy bound for a charged object by employing thermodynamics of the black hole.
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Self-Forces as Nonlocal Probes of Gravastar Interiors
For charges held near a gravastar, the self-force carries information about the interior, giving explicitly computable differences from the black-hole case.