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SUMMARY:The Nonlinear Tails of Black Hole Ringdown
DTSTART;VALUE=DATE-TIME:20260522T061000Z
DTEND;VALUE=DATE-TIME:20260522T065000Z
DTSTAMP;VALUE=DATE-TIME:20260530T195802Z
UID:indico-contribution-2462@indico.itp.ac.cn
DESCRIPTION:Speakers: Sam Wong (City University of Hong Kong)\nBlack hole 
 perturbation theory is a cornerstone of gravitational wave science\, provi
 ding a powerful framework to test General Relativity in the strong-field r
 egime and to characterize the final remnant of a binary merger. The final 
 "ringdown" phase\, where the newly formed black hole settles into its stat
 ionary state\, is a particularly clean probe of its fundamental properties
 . In this talk\, I will begin by reviewing the essential structure of the 
 Green's function in black hole perturbation theory\, which governs the res
 ponse of the black hole to any disturbance. I will then present our main r
 esult on the late-time behavior of gravitational waves\, demonstrating the
  existence of non-linearly generated power-law tails that dominate after t
 he initial ringdown signal has decayed. We show that this late-time tail i
 s a generic and robust feature for spinning black holes\, carrying importa
 nt information about the nonlinear nature of spacetime dynamics. If time p
 ermits\, I will also briefly discuss the connection between these nonlinea
 r phenomena and the behavior of tidal Love numbers during the inspiral pha
 se.\n\nhttps://indico.itp.ac.cn/event/419/contributions/2462/
LOCATION:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2462/
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