BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//talks.cam.ac.uk//v3//EN
BEGIN:VTIMEZONE
TZID:Europe/London
BEGIN:DAYLIGHT
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
TZNAME:BST
DTSTART:19700329T010000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
TZNAME:GMT
DTSTART:19701025T020000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CATEGORIES:Astro Data Science Discussion Group
SUMMARY:Novel Approaches to Black Hole Ringdown Fits - Ric
 hard Dyer (IoA)
DTSTART;TZID=Europe/London:20250616T160000
DTEND;TZID=Europe/London:20250616T170000
UID:TALK233041AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/233041
DESCRIPTION:Following a merger\, a perturbed black hole relaxe
 s into its final Kerr state\, in part by radiating
  quasinormal modes (QNMs) — oscillations with spec
 ific complex frequencies and angular structures pr
 edicted by black hole perturbation theory. QNMs ar
 e widely used in waveform modelling and underpin k
 ey tests of general relativity and the nature of c
 ompact objects\, though challenges remain\, partic
 ularly in avoiding overfitting through well-motiva
 ted mode selection.\nIn this talk\, I will introdu
 ce new techniques for detecting and analysing QNMs
 \, including spatial mapping\, which extracts thei
 r angular structure\, and a fast Bayesian fitting 
 approach that models numerical relativity noise wi
 th Gaussian processes\, providing a robust alterna
 tive to least-squares methods.\nI will present res
 ults obtained using the latest high-fidelity Cauch
 y-characteristic evolution (CCE) simulations by th
 e SXS collaboration and show how these methods pro
 vide insight into the role of overtones and nonlin
 ear effects\, both of which will be important for 
 future gravitational wave observations.  
LOCATION:Martin Ryle Seminar Room\, KICC
CONTACT:Dr Priscilla Canizares
END:VEVENT
END:VCALENDAR