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A recipe for echoes from exotic compact objects

Mark, Zachary and Zimmerman, Aaron and Du, Song Ming and Chen, Yanbei (2017) A recipe for echoes from exotic compact objects. Physical Review D, 96 (8). Art. No. 084002. ISSN 2470-0010. doi:10.1103/PhysRevD.96.084002.

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Gravitational wave astronomy provides an unprecedented opportunity to test the nature of black holes and search for exotic, compact alternatives. Recent studies have shown that exotic compact objects (ECOs) can ring down in a manner similar to black holes, but can also produce a sequence of distinct pulses resembling the initial ringdown. These “echoes” would provide definite evidence for the existence of ECOs. In this work we study the generation of these echoes in a generic, parametrized model for the ECO, using Green’s functions. We show how to reprocess radiation in the near-horizon region of a Schwarzschild black hole into the asymptotic radiation from the corresponding source in an ECO spacetime. Our methods allow us to understand the connection between distinct echoes and ringing at the resonant frequencies of the compact object. We find that the quasinormal mode ringing in the black hole spacetime plays a central role in determining the shape of the first few echoes. We use this observation to develop a simple template for echo waveforms. This template preforms well over a variety of ECO parameters, and with improvements may prove useful in the analysis of gravitational waves.

Item Type:Article
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URLURL TypeDescription Paper
Chen, Yanbei0000-0002-9730-9463
Additional Information:© 2017 American Physical Society. Received 26 June 2017; published 3 October 2017. We thank Vitor Cardoso, Baoyi Chen, Chad Galley, Davide Gerosa, Yiqiu Ma, David Nichols, Samaya Nissanke, Paolo Pani, Leo Stein, Saul Teukolsky, and Huan Yang for valuable discussions. We are grateful to Ofek Birnholtz, Vitor Cardoso, Gaurav Khanna, Hiroyuki Nakano, and Paolo Pani for providing feedback on a draft of this manuscript. The figures were made using the MaTeX package [66]. This research was supported at Caltech by NSF Grant No. PHY-1404569, the Walter Burke Institute for Theoretical Physics, and the David and Barbara Groce startup fund.
Group:Walter Burke Institute for Theoretical Physics, Astronomy Department
Funding AgencyGrant Number
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
David and Barbara Groce Startup Fund, CaltechUNSPECIFIED
Issue or Number:8
Record Number:CaltechAUTHORS:20171003-105036903
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81991
Deposited By: Tony Diaz
Deposited On:03 Oct 2017 18:00
Last Modified:15 Nov 2021 19:47

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