Regular Article - Theoretical Physics
Are gravitational wave ringdown echoes always equal-interval?
School of Physics, University of Chinese Academy of Sciences, Beijing, 100049, China
2 Department of Physics and Astronomy, York University, Toronto, ON, M3J 1P3, Canada
3 Interdisciplinary Center for Theoretical Study, University of Science and Technology of China, Hefei, 230026, Anhui, China
4 Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing, 100190, China
* e-mail: email@example.com
Accepted: 3 June 2018
Published online: 11 June 2018
Gravitational wave (GW) ringdown waveforms may contain “echoes” that encode new physics in the strong gravity regime. It is commonly assumed that the new physics gives rise to the GW echoes whose intervals are constant. We point out that this assumption is not always applicable. In particular, if the post-merger object is initially a wormhole, which slowly pinches off and eventually collapses into a black hole, the late-time ringdown waveform exhibit a series of echoes whose intervals are increasing with time. We also assess how this affects the ability of Advanced LIGO/Virgo to detect these new signals.
© The Author(s), 2018