Eccentric binary black holes: Comparing numerical relativity and small mass-ratio perturbation theory
arXiv:2209.03390 · doi:10.1103/PhysRevD.106.124040
Abstract
The modelling of unequal mass binary black hole systems is of high importance to detect and estimate parameters from these systems. Numerical relativity (NR) is well suited to study systems with comparable component masses, , whereas small mass ratio (SMR) perturbation theory applies to binaries where . This work investigates the applicability for NR and SMR as a function of mass ratio for eccentric non-spinning binary black holes. We produce NR simulations with mass ratios between and and initial eccentricities up to . From these we extract quantities like gravitational wave energy and angular momentum fluxes and periastron advance, and assess their accuracy. To facilitate comparison, we develop tools to map between NR and SMR inspiral evolutions of eccentric binary black holes. We derive post-Newtonian accurate relations between different definitions of eccentricity. Based on these analyses, we introduce a new definition of eccentricity based on the (2,2)-mode of the gravitational radiation, which reduces to the Newtonian definition of eccentricity in the Newtonian limit. From the comparison between NR simulations and SMR results, we quantify the unknown next-to-leading order SMR contributions to the gravitational energy and angular momentum fluxes, and periastron advance. We show that in the comparable mass regime these contributions are subdominant and higher order SMR contributions are negligible.
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