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Accurate waveforms for generic planar-orbit binary black holes: The multipolar effective-one-body model SEOBNRv6EHM

Aldo Gamboa1,*, Alessandra Buonanno1,2, Lorenzo Pompili3,1, Raffi Enficiaud1, Michael Boyle4, Lawrence E. Kidder4, Oliver Long1, Peter James Nee1, Harald P. Pfeiffer1 et al.

Antoni Ramos-Buades5,1 and Mark A. Scheel6

  • *Contact author: aldo.gamboa@aei.mpg.de
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Phys. Rev. D 114, 104010 – Published 3 November, 2026

DOI: https://doi.org/10.1103/shbg-989s

Abstract

Accurate and computationally efficient waveform models are required to infer the parameters of compact binaries from their gravitational-wave (GW) emission. Among these parameters, orbital eccentricity serves as a smoking gun for dynamical formation channels and must be accounted for to avoid systematic errors in GW analyses. Here, we present SEOBNRv6EHM, a time domain, multipolar waveform model for binaries on generic planar orbits, calibrated to quasicircular (QC) numerical relativity (NR) simulations from SXS Collaboration. In addition to the dominant (2, 2) mode, the model provides the (2, 1), (3, 3), (3, 2), (4, 4), and (4, 3) multipoles for the full inspiral-merger-ringdown process of coalescing binaries, as well as for dynamical captures and scattering encounters. The model is built within the effective-one-body (EOB) framework, and it employs novel resummations of the radiation-reaction force and waveform modes. We validate its accuracy through comparisons against 592 QC, 319 eccentric, one dynamical capture, and two scattering SXS NR waveforms, and through scattering-angle comparisons against 61 SXS NR simulations. For QC and small-eccentricity binaries, its accuracy is comparable to previous-generation SEOBNRv5 models. For highly eccentric systems, however, SEOBNRv6EHM attains unprecedented accuracy, with waveform mismatches remaining below or close to 2% across the total mass range 20–200M⊙ for eccentricities up to ∼0.9 at 14 periastron passages before merger. Additionally, SEOBNRv6EHM achieves waveform generation wall times that are 2–8 times faster than other state-of-the-art EOB eccentric models, enabling efficient and accurate applications in GW astronomy.

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Eccentric and unbound compact binaries in the LIGO-Virgo-KAGRA catalog: Parameter estimation and waveform systematics with seobnrv6ehm

Lorenzo Pompili, Aldo Gamboa, and Alessandra Buonanno
Phys. Rev. D 114, 104009 (2026)

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Outline

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Phys. Rev. D 114, 104010– Published 3 November, 2026
  • Received 12 June 2026
  • Accepted 30 September 2026
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