BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Testing general relativity with the ringdown of gravitational-wave observations DTSTART:20251204T143000Z DTEND:20251204T160000Z DTSTAMP:20260801T001647Z UID:91562d03-0e6d-4cb3-839f-c8c8b04cad1e SEQUENCE:1 CREATED:20251202T154957Z DESCRIPTION: Gravitational waves provide a unique opportunity to test grav ity and probe the nature of astrophysical sources. With hundreds of binary coalescences detected by LIGO and Virgo\, general relativity continues to stand as a successful theory of gravity. The loudest event to date\, GW25 0114\, offered a direct probe of the remnant’s Kerr nature by constraini ng multiple ringdown modes. In contrast\, the second loudest signal\, GW23 0814\, exhibits a ringdown damping time shorter than predicted by general relativity. Simulations indicate that such deviations can arise from missi ng physics in waveform models or noise artefacts\, suggesting no evidence for a breakdown of general relativity. In this talk\, I will present analy ses of recently observed gravitational-wave signals and discuss the prospe cts for testing fundamental physics with next-generation detectors. LAST-MODIFIED:20251202T154957Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/en/events/testing-general-relativity- with-the-ringdown-of-gravitational-wave-observations/ X-ALT-DESC;FMTTYPE=text/html:

Gravitational wave s provide a unique opportunity to test gravity and probe the nature of ast rophysical sources. With hundreds of binary coalescences detected by LIGO and Virgo\, general relativity continues to stand as a successful theory o f gravity.

The loudest event to date\, GW250114\, offered a dire ct probe of the remnant’s Kerr nature by constraining multiple ringdown modes. In contrast\, the second loudest signal\, GW230814\, exhibits a rin gdown damping time shorter than predicted by general relativity.

Simulations indicate that such deviations can arise from missing physics in waveform models or noise artefacts\, suggesting no evidence for a break down of general relativity. In this talk\, I will present analyses of rece ntly observed gravitational-wave signals and discuss the prospects for tes ting fundamental physics with next-generation detectors.

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