BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Black hole scattering with numerical methods and the resummation o f weak-field analytic expressions DTSTART:20260430T143000Z DTEND:20260430T160000Z DTSTAMP:20260920T001108Z UID:bcd353f4-c4ab-4a68-8868-e69d155534af SEQUENCE:1 CREATED:20260428T091039Z DESCRIPTION: Recent advances in modelling unbound binary black hole intera ctions have been driven by the application of scattering amplitude methods from high-energy physics to generate results within the post-Minkowskian (PM) expansion. However\, this expansion breaks down when approaching the strong-field regime\, where large curvature effects become non-negligible. In this talk\, I will present recent progress in the numerical modelling of strong-field black hole scattering using two complementary approaches. First\, I will demonstrate how compactified hyperboloidal coordinates enab le stable evolution of the Teukolsky equation in the self-force (SF) frame work. Second\, I will show how strong-field SF information can be used to resum the weak-field PM and post-Newtonian series\, yielding accurate pred ictions of radiative quantities across all separations for both bound and unbound orbits. Finally\, I will discuss the adaptation of the Spectral Ei nstein Code (SpEC) to perform highly accurate Numerical Relativity simulat ions of black hole scattering\, which have allowed the extraction of highe r-order SF coefficients and the benchmarking of PM expressions. LAST-MODIFIED:20260428T091039Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/en/events/black-hole-scattering-with- numerical-methods-and-the-resummation-of-weak-field-analytic-expressions/ X-ALT-DESC;FMTTYPE=text/html:

Recent advances in modelling unbound binary black hole interactions have been driven by the application of scattering amplitude methods from high-energy physics to ge nerate results within the post-Minkowskian (PM) expansion. However\, this expansion breaks down when approaching the strong-field regime\, where lar ge curvature effects become non-negligible. In this talk\, I will present recent progress in the numerical modelling of strong-field black hole scat tering using two complementary approaches.

First\, I will demons trate how compactified hyperboloidal coordinates enable stable evolution o f the Teukolsky equation in the self-force (SF) framework. Second\, I will show how strong-field SF information can be used to resum the weak-field PM and post-Newtonian series\, yielding accurate predictions of radiative quantities across all separations for both bound and unbound orbits.

Finally\, I will discuss the adaptation of the Spectral Einstein Code (SpEC) to perform highly accurate Numerical Relativity simulations of bla ck hole scattering\, which have allowed the extraction of higher-order SF coefficients and the benchmarking of PM expressions.

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