BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Luca Santoni (U. Columbia) DTSTART:20210121T150000Z DTEND:20210121T160000Z DTSTAMP:20260423T003245Z UID:IFTWeb/27 DESCRIPTION:Title: Symmetries of black hole perturbations\nby Luca Santoni (U. Columbia) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe direct detection of grav itational waves has marked the dawn of the era of gravitational-wave astro nomy. With an ever increasing number of observed black hole mergers and wi th the possibility of precise measurements achievable with third-generatio n and space-based detectors\, gravitational-wave astronomy is providing us with a unique opportunity to test general relativity in the strong-field regime. In order to understand how gravity works at the fundamental level and explain some still unsolved mysteries about black holes and compact ob jects\, symmetries play a special role. Symmetries allow\, e.g.\, to make robust and model-independent predictions for the observables\, and constra in broad classes of theories beyond general relativity. \nAfter a short re view of black hole perturbation theory\, I will discuss properties of pert urbations around Schwarzschild black holes. I will discuss\, in particular \, the implications of symmetries at the level of the observables. These i nclude the quasi-normal mode spectrum and the static response of black hol es\, a.k.a. the Love numbers. If time permits\, I will introduce an effect ive field theory for perturbations around “hairy” black holes and disc uss how gravitational-wave observations could be used to constrain the cou plings of the operators in the theory.\n LOCATION:https://researchseminars.org/talk/IFTWeb/27/ END:VEVENT END:VCALENDAR