Intermediate mass-ratio black hole binaries: Applicability of small mass-ratio perturbation theory

Abstract

The dynamics of merging black hole binaries with small mass-ratios (SMR) can be expressed as a series in the symmetric mass-ratio, the post-adiabatic expansion. Using numerical relativity simulations, we compute the first three terms in this series for quasicircular non-spinning binaries. We recover the leading term predicted by SMR perturbation theory, and obtain a robust prediction of the 1-post-adiabatic term. The 2-post-adiabatic term is found to be small, indicating that the 1PA approximation may be quite accurate even for nearly comparable mass binaries. We also estimate the range of applicability for SMR and post-Newtonian series for non-spinning, quasi-circular inspirals.

arXiv comment6 pages, 4 figures, published version

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