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SUMMARY:New results on the perturbed remnants of binary black hole mergers
  - Lionel London (University of Cardiff)
DTSTART:20180126T130000Z
DTEND:20180126T140000Z
UID:TALK99040@talks.cam.ac.uk
CONTACT:Michalis Agathos
DESCRIPTION:The aftermath of binary black hole coalescence is a perturbed 
 remnant whose gravitational radiation rings down\, encoding information ab
 out the new black hole's recent history and current state. It is expected 
 that this ringdown radiation will be composed primarily of Kerr quasi-norm
 al modes\, and thereby enable tests of general relativity. In this talk I 
 present the first ringdown model that captures the amplitude and relative 
 phase of the dominant and subdominant quasi-normal modes for non-precessin
 g binary black holes systems. For the first time it is noticed that the do
 minant mode's excitation is a remarkably simple function of system paramet
 ers\, suggesting that an analytic treatment may be within reach. Applicati
 on of the model to parameter estimation indicates that some mode amplitude
 s and relative phases are in general very difficult to constrain\, while o
 thers are well constrained\, even for low SNR signals. GW150914 is discuss
 ed as an example case.
LOCATION:Pavilion B Potter Room (B1.19)
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