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SUMMARY:Black hole spectroscopy\, nonlinear gravity and Hawking's Area Law
 : the physics behind GW250114  - Gregorio Carullo (Birmingham University) 
DTSTART:20251114T130000Z
DTEND:20251114T140000Z
UID:TALK237742@talks.cam.ac.uk
CONTACT:Daniela Cors
DESCRIPTION:The study of black holes resonant excitation and their subsequ
 ent relaxation ("Black Hole Spectroscopy") is a fundamental tool to observ
 ationally investigate gravity in its most dynamical and violent regime. Th
 e unprecedented loudness of the gravitational wave signal GW250114 - enabl
 ed by the exquisite measurement precision of ground-based interferometers 
 - recently allowed us to exploit spectroscopic techniques to achieve the f
 irst accurate verification of two long-standing predictions of general rel
 ativity: Hawking's Area Law and the Kerr nature of the source. I will disc
 uss these fascinating results\, the data-analysis and modelling challenges
  behind them\, and the ultimate limitations of these investigations.\n\nIn
 deed\, despite the striking simplicity of black holes\, and decades of dev
 elopments in classical perturbation theory\, many dynamical and nonlinear 
 properties of black holes remain unknown. Such ignorance prevents even mor
 e exciting explorations of the enigmatic phase in which two black holes fu
 se together\, the "merger" regime. In the last part of the seminar\, I wil
 l summarise recent breakthroughs in this direction\, and their potential t
 o advance our understanding of gravity\, searches for new physics\, and to
  harvest the full potential of next-generation detectors.
LOCATION:Potter Room / Zoom 
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