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:20260802T115354Z UID:dc077540-ccea-40c7-a122-5e8a083e4c2b SEQUENCE:2 CREATED:20251117T094418Z DESCRIPTION:The study of black holes'\; resonant excitation and their subsequent relaxation ("\;Black Hole Spectroscopy"\;) is a fundame ntal tool to observationally investigate gravity in its most dynamical and violent regime. Recently\, the unprecedented loudness of the gravitationa l wave signal GW250114 allowed us to exploit spectroscopic techniques to a chieve the first accurate verification of two long-standing predictions of general relativity: Hawking'\;s Area Law and the Kerr nature of the s ource. The physical process behind these signals\, namely the end state of the gravitational two-body problem\, has been numerically solved twenty y ears ago. However\, despite the striking simplicity of black holes\, and d ecades of developments in classical perturbation theory\, a first-principl es understanding of the dynamical stage in which two black holes fuse toge ther (the "\;merger"\; regime)\, is still lacking. Such ignorance prevents even more exciting observational explorations\, and the construct ion of signal models in richer scenarios. In this seminar I will detail re cent breakthroughs in this direction\, and their potential to advance our understanding of gravity\, searches for new physics\, and to harvest the f ull potential of next-generation detectors in achieving high-precision mea surements. LAST-MODIFIED:20251117T094434Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/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 ("\;B lack Hole Spectroscopy"\;) is a fundamental tool to observationally in vestigate gravity in its most dynamical and violent regime. Recently\, the unprecedented loudness of the gravitational wave signal GW250114 allowed us to exploit spectroscopic techniques to achieve the first accurate verif ication of two long-standing predictions of general relativity: Hawking&#x 27\;s Area Law and the Kerr nature of the source.

The physical p rocess behind these signals\, namely the end state of the gravitational tw o-body problem\, has been numerically solved twenty years ago. However\, d espite the striking simplicity of black holes\, and decades of development s in classical perturbation theory\, a first-principles understanding of t he dynamical stage in which two black holes fuse together (the "\;merg er"\; regime)\, is still lacking.

Such ignorance prevents ev en more exciting observational explorations\, and the construction of sign al models in richer scenarios. In this seminar I will detail recent breakt hroughs in this direction\, and their potential to advance our understandi ng of gravity\, searches for new physics\, and to harvest the full potenti al of next-generation detectors in achieving high-precision measurements.< /p> END:VEVENT END:VCALENDAR