The ongoing observations of merging black holes by the instruments of the fledging gravitational wave astronomy has opened the way for testing the general-relativistic Kerr black hole metric and, at the same time, for probing the existence of more speculative horizonless ultracompact objects. In this paper we quantify the difference that these two classes of objects may exhibit in the post-merger ringdown signal. By considering rotating systems in general relativity and assuming an eikonal limit and a third-order Hartle-Thorne slow-rotation approximation, we provide the first calculation of the early ringdown frequency and damping time as a function of the body's multipolar structure. Using the example of a gravastar, we show that the main ringdown signal may differ by as much as a few percent with respect to that of a Kerr black hole, a deviation that could be probed by near-future Advanced LIGO/Virgo searches.

How well can ultracompact bodies imitate black hole ringdowns? / Glampedakis, Kostas; Pappas, Georgios. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - STAMPA. - 97:4(2018). [10.1103/PhysRevD.97.041502]

How well can ultracompact bodies imitate black hole ringdowns?

Pappas, Georgios
2018

Abstract

The ongoing observations of merging black holes by the instruments of the fledging gravitational wave astronomy has opened the way for testing the general-relativistic Kerr black hole metric and, at the same time, for probing the existence of more speculative horizonless ultracompact objects. In this paper we quantify the difference that these two classes of objects may exhibit in the post-merger ringdown signal. By considering rotating systems in general relativity and assuming an eikonal limit and a third-order Hartle-Thorne slow-rotation approximation, we provide the first calculation of the early ringdown frequency and damping time as a function of the body's multipolar structure. Using the example of a gravastar, we show that the main ringdown signal may differ by as much as a few percent with respect to that of a Kerr black hole, a deviation that could be probed by near-future Advanced LIGO/Virgo searches.
Physics and Astronomy (miscellaneous)
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How well can ultracompact bodies imitate black hole ringdowns? / Glampedakis, Kostas; Pappas, Georgios. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - STAMPA. - 97:4(2018). [10.1103/PhysRevD.97.041502]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1122410
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