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SUMMARY:Novel Approaches to Black Hole Ringdown Fits - Richard Dyer (IoA)
DTSTART:20250616T150000Z
DTEND:20250616T160000Z
UID:TALK233041@talks.cam.ac.uk
CONTACT:Dr Priscilla Canizares
DESCRIPTION:Following a merger\, a perturbed black hole relaxes into its f
 inal Kerr state\, in part by radiating quasinormal modes (QNMs) — oscill
 ations with specific complex frequencies and angular structures predicted 
 by black hole perturbation theory. QNMs are widely used in waveform modell
 ing and underpin key tests of general relativity and the nature of compact
  objects\, though challenges remain\, particularly in avoiding overfitting
  through well-motivated mode selection.\nIn this talk\, I will introduce n
 ew techniques for detecting and analysing QNMs\, including spatial mapping
 \, which extracts their angular structure\, and a fast Bayesian fitting ap
 proach that models numerical relativity noise with Gaussian processes\, pr
 oviding a robust alternative to least-squares methods.\nI will present res
 ults obtained using the latest high-fidelity Cauchy-characteristic evoluti
 on (CCE) simulations by the SXS collaboration and show how these methods p
 rovide insight into the role of overtones and nonlinear effects\, both of 
 which will be important for future gravitational wave observations.  
LOCATION:Martin Ryle Seminar Room\, KICC
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