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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie

GR 2: Gravitational Waves I

GR 2.1: Talk

Monday, March 16, 2026, 16:15–16:30, KH 01.016

Insights from the test-mass limit for effective-one-body models: elliptic and hyperbolic motion — •Simone Albanesi for the Einstein Telescope collaboration — Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, 07743, Jena, Germany — INFN sezione di Torino, Torino, Italy

The effective-one-body (EOB) approach provides an accurate description of the dynamics of comparable mass binaries, including non-circularized configurations. By construction, the EOB formalism incorporates the test-mass limit and can therefore strongly benefit from results obtained in black-hole perturbation theory. In this talk, we discuss recent test-mass results for elliptic and hyperbolic motion and show how these results can be used to better understand and inform the analytical prescriptions employed in EOB models. We further analyze the merger properties of eccentric binaries and dynamical captures in the test-mass limit. These results provide guidance for the construction of a generic mass-ratio ringdown model, enabling a more complete description of non-circularized plunge-mergers. Finally, we discuss new numerical relativity simulations and highlight their analogies with the test-mass case.

Keywords: Binary black holes; Effective-one-body; Perturbation theory; Ringdown; Numerical relativity