BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Numerically solved\, but not yet understood: recent advancements i n the gravitational twobody problem DTSTART:20251120T143000Z DTEND:20251120T160000Z DTSTAMP:20260810T234624Z UID:dc077540-ccea-40c7-a122-5e8a083e4c2b SEQUENCE:1 CREATED:20251117T094407Z DESCRIPTION: The study of black holes'\; resonant excitation and their subsequent relaxation ("\;Black Hole Spectroscopy"\;) is a fundam ental tool to observationally investigate gravity in its most dynamical an d violent regime. Recently\, the unprecedented loudness of the gravitation al wave signal GW250114 allowed us to exploit spectroscopic techniques to achieve the first accurate verification of two long-standing predictions o f general relativity: Hawking'\;s Area Law and the Kerr nature of the source. The physical process behind these signals\, namely the end state o f the gravitational two-body problem\, has been numerically solved twenty years ago. However\, despite the striking simplicity of black holes\, and decades of developments in classical perturbation theory\, a first-princip les understanding of the dynamical stage in which two black holes fuse tog ether (the "\;merger"\; regime)\, is still lacking. Such ignorance prevents even more exciting observational explorations\, and the construc tion of signal models in richer scenarios. In this seminar I will detail r ecent breakthroughs in this direction\, and their potential to advance our understanding of gravity\, searches for new physics\, and to harvest the full potential of next-generation detectors in achieving high-precision me asurements. LAST-MODIFIED:20251117T094407Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/en/events/numerically-solved-but-not- yet-understood-recent-advancements-in-the-gravitational-twobody-problem/ X-ALT-DESC;FMTTYPE=text/html:

The study of black holes'\; resonant excitation and their subsequent relaxation ("\; Black Hole Spectroscopy"\;) is a fundamental tool to observationally i nvestigate gravity in its most dynamical and violent regime. Recently\, th e unprecedented loudness of the gravitational wave signal GW250114 allowed us to exploit spectroscopic techniques to achieve the first accurate veri fication of two long-standing predictions of general relativity: Hawking&# x27\;s Area Law and the Kerr nature of the source.

The physical process behind these signals\, namely the end state of the gravitational t wo-body problem\, has been numerically solved twenty years ago. However\, despite the striking simplicity of black holes\, and decades of developmen ts in classical perturbation theory\, a first-principles understanding of the dynamical stage in which two black holes fuse together (the "\;mer ger"\; regime)\, is still lacking.

Such ignorance prevents e ven more exciting observational explorations\, and the construction of sig nal models in richer scenarios. In this seminar I will detail recent break throughs in this direction\, and their potential to advance our understand ing of gravity\, searches for new physics\, and to harvest the full potent ial of next-generation detectors in achieving high-precision measurements.

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