MG15 - Talk detail

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Abstract

Gravitational-wave astronomy can give us access to structure of black holes, potentially probing microscopic corrections at the horizon scale. In this talk I will investigate a general model of exotic compact object consisting of a Kerr geometry with a reflective surface near the horizon. This framework can be applied to thin-shell wormholes when the surface is perfectly reflecting. I will analyze the stability of these geometries under scalar and electromagnetic perturbations. I will show that exotic compact objects with a perfectly reflecting surface are affected by the an ergoregion instability when spinning sufficiently fast. This instability might have a crucial impact on their phenomenology. On the other hand, I will describe an effect that can prevent the ergoregion instability from developing. A partial absorption at the surface is sufficient to quench the instability completely. This finding has important consequences for the viability of exotic compact objects and it suggests that they are not necessarily ruled out by the ergoregion instability.

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