Towards a gravitational self force-informed effective-one-body waveform model for nonprecessing, eccentric, large-mass-ratio inspirals

TL;DR

This paper introduces a new effective-one-body waveform model for eccentric, large-mass-ratio inspirals, incorporating gravitational self-force data to enhance accuracy in the strong-field regime for future gravitational wave detection.

Contribution

The paper develops a GSF-informed EOB model for eccentric inspirals in the large-mass-ratio regime, integrating PN, NR, and GSF insights for improved waveform predictions.

Findings

Model effectively incorporates GSF data for strong-field accuracy

Uses Padé resummation for improved potential behavior

Provides a framework for eccentric EMRI waveform generation

Abstract

Building upon several recent advances in the development of effective-one-body models for spin-aligned eccentric binaries with individual masses $(m_1,m_2)$ we introduce a new EOB waveform model that aims at describing inspiralling binaries in the large mass-ratio regime, $m_1\gg m_2$. The model exploits the current state-of-the-art TEOBResumS-Dali model for eccentric binaries, but the standard EOB potentials $(A,\bar{D},Q)$, informed by Numerical Relativity (NR) simulations, are replaced with the corresponding functions that are linear in the symmetric mass ratio $\nu\equiv m_1 m_2/(m_1+m_2)^2$ taken at 8.5PN accuracy. To improve their strong-field behavior, these functions are: (i) suitably factorized and resummed using Pad\'e approximants and (ii) additionally effectively informed to state-of-the-art numerical results obtained by gravitational self-force theory (GSF). For simplicity, the spin-sector of the model is taken to be the one of TEOBResumS-Dali, though removing the NR-informed spin-orbit effective corrections. We propose the current GSF-informed EOB framework as a conceptually complete analytical tool to generate waveforms for eccentric Extreme (and Intermediate) Mass Ratio Inspirals for future gravitational wave detectors.