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  • Letter
  • Open Access

Real modes and null memory contributions in effective-one-body models

Simone Albanesi*

  • *Contact author: simone.albanesi@uni-jena.de
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Phys. Rev. D 111, L121501 – Published 9 June, 2025

DOI: https://doi.org/10.1103/PhysRevD.111.L121501

Abstract

We introduce a novel approach to describe real-valued m=0 modes from inspiral to merger and ringdown in effective-one-body models, including both oscillatory and null memory contributions. A crucial aspect of the modelization of the oscillatory part is the complexification of the real modes via a Hilbert transform. This procedure allows for an accurate description of the merger-ringdown waveform by applying standard approaches employed for the complex m>0 modes, which include source-driven effects. The physical signal is then recovered by solely considering the real part. We apply this method in the extreme-mass-ratio regime, considering particle-driven linear gravitational perturbations in Schwarzschild and Kerr spacetimes. We then extend our description to spin-aligned, quasicircular, comparable-mass binaries providing hierarchical fits incorporating the test-mass limit. The postmerger waveform is then matched with an inspiral effective-one-body waveform. By adopting TEOBResumS-GIOTTO as our baseline, we also include the displacement memory in the (2, 0) mode through Bondi–van der Burg–Metzner-Sachs balance laws, thus providing a complete effective-one-body model incorporating both oscillatory and null memory effects. The accuracy of this model is validated against the hybrid numerical relativity surrogate NRHybSur3dq8_CCE, finding, for the quadrupole of the equal mass nonspinning case, a LIGO noise-weighted mismatch of F¯=6×10−4 at 50M⊙ for the inclination that maximizes the contribution of the (2, 0) mode.

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Phys. Rev. D 111, L121501– Published 9 June, 2025
  • Received 12 November 2024
  • Revised 13 April 2025
  • Accepted 6 May 2025
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