BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Jonathan Thompson (Cardiff U.) DTSTART:20210415T133000Z DTEND:20210415T143000Z DTSTAMP:20260423T035939Z UID:CENTRA/41 DESCRIPTION:Title: Modelling precession in gravitational waves through inspiral\, merger and ringdown\nby Jonathan Thompson (Cardiff U.) as part of CENTRA Seminar\ n\n\nAbstract\nAs gravitational wave detectors increase in sensitivity\, p reviously unmodelled physical effects will play an important role in advan cing the accuracy of future gravitational wave models. For signals arising from precessing compact binaries\, current models map non-precessing wave forms onto the precessing parameter space through a non-inertial rotation using Euler angles derived from the post-Newtonian dynamics of the inspira ling system. While these angles approximate well the motion of the orbital plane relative to the direction of total (fixed) angular momentum at earl y times or low frequencies of the signal\, the morphology of these angles disagrees strongly with numerical relativity results through merger and ri ngdown\, where the post-Newtonian approximation breaks down. We present th e first model of these precession angles that has been tuned to precessing numerical relativity simulations through merger and ringdown\, and discus s additional changes to the underlying non-precessing waveform needed to e nsure accuracy for more challenging precessing binaries with higher mass r atios and spin magnitudes.\n LOCATION:https://researchseminars.org/talk/CENTRA/41/ END:VEVENT END:VCALENDAR