BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Francisco Duque (CENTRA\, Instituto Superior Técnico) DTSTART:20210318T143000Z DTEND:20210318T153000Z DTSTAMP:20260423T035745Z UID:CENTRA/36 DESCRIPTION:Title: Gravitational tuning forks and hierarchical triple systems\nby Francis co Duque (CENTRA\, Instituto Superior Técnico) as part of CENTRA Seminar\ n\n\nAbstract\nThe LIGO-Virgo collaboration recently reported evidence for coalescences involving hierarchical triples composed by a stellar-mass bi nary system in the vicinity of a supermassive black hole (SMBH). We study gravitational wave emission in the strong-field regime of these systems an d find that the binary system can resonantly excite the quasinormal modes of the SMBH\, as in the resonant excitation of two tuning forks with match ing frequencies. Moreover\, the flux of energy crossing the SMBH horizon can be much more significant than in the standard extreme-mass-ratio inspi rals. Consequently\, these systems have a natural mechanism to probe stron g-field physics. This can lead to distinctive signatures in their waveform such as Doppler shifts\, aberration\, lensing and strong amplitude modula tions Finally\, we address the impact of our results for the space-based L ISA mission\, which is particularly designed to detect gravitiational wave s originated in galactic centers\, where hierarchical triple systems are k nown to be abundant.\n LOCATION:https://researchseminars.org/talk/CENTRA/36/ END:VEVENT END:VCALENDAR