Spurred on by recent advances in post-Minkowskian (PM) gravity, highly accurate models of black hole scattering have emerged. By incorporating PM information in the effective one body (EOB) framework, its range of validity can be extended to the strong field regime. Central to these models is the EOB mass-shell condition, which relies upon a number of different choices of gauge and a specific...
In this presentation we expose the results of a recent study concerning a new way of resuming, at a given order in the soft limit, the infinite series of PM or PN corrections to the gravitational waveform produced by a particle moving around a Schwarzschild black hole in the test mass limit. The tool that has allowed to do this is a novel hypergeometric representation of the confluent Heun...
In this talk, based on the recent work[ [2503.05487]][1], I will present a new way of formulating the effective-one-body (EOB) dynamics, particularly useful for implementing post-Minkowskian results in waveform models for compact binaries. After having motivated the change of paradigm that this new approach brings forth, I will go over its main characteristics and show how it yields, with...
The study of unbound binary-black-hole encounters provides a gauge-invariant approach to exploring strong-field gravitational interactions in two-body systems, which can subsequently inform waveform models for bound orbits. In this talk, we compare our NR scattering angle results from the Spectral Einstein Code (SpEC) to the post-Minkowskian PM-based effective-one-body (EOB) closed-form models...
The dynamics of precessing black-hole binaries in the post-Newtonian regime is deeply characterized by a timescale hierarchy: the orbital timescale is short compared to the spin-precession timescale which, in turn, is shorter than the radiation-reaction timescale on which the orbit is shrinking due to gravitational-wave emission. I present the development of a generic multi-timescale analysis...
Orbital eccentricity and spin precession are precious observables to infer the formation history of binary black holes with gravitational-wave data. We present a post-Newtonian, multi-timescale analysis of the binary dynamics able to capture both precession and eccentricity over long inspirals. We show that the evolution of an eccentric binary can be reduced that of effective source on...
In this talk, we present 52 new numerical-relativity (NR) simulations of black-hole-neutron-star merger (BHNS) mergers and employ the data to inform TEOBResumS-Dalí: a multipolar effective-one-body model also including precession and eccentricity. Our simulations target quasicircular mergers and the parameter space region characterized by significant tidal disruption of the star. Convergent...
In this talk, I will show and describe gravitational waveforms generated by critical, equatorial plunging geodesics of the Kerr metric that start from an unstable-circular-orbit, which describe the test-mass limit of spin-aligned eccentric black-hole mergers. The waveforms are generated employing a time-domain Teukolsky code. We span different values of the Kerr spin −0.99 ≤ a ≤ 0.99 and of...
In this talk I'm going to revisit the problem of gravitational-wave extraction in numerical relativity with gauge- invariant metric perturbation theory of spherical spacetimes. We present our extraction algorithm which allows the computation of even-parity (Zerilli-Moncrief) and odd-parity (Regge-Wheeler) multipoles of the strain from a (3+1) metric without the assumption that the spherical...
We briefly discuss how to incorporate real ($m=0$) modes in EOB models for circularized binary black holes, considering both the oscillatory part (Bondi mass aspect) and the null memory contribution. Using numerical data, we then explicitly construct and validate a model for the $(2,0)$ multipole.
The use of quasi-circular effective-one-body waveforms in Bayesian mock analyses of signals from eccentric binary neutron star mergers can lead to signal-to-noise losses and to significant deviations in the inference of the chirp mass, the mass ratio and the effective spin, yielding incorrect and ambiguous source identification. The inclusion of spin precession in the quasi-circular waveform...
