Time-domain effective-one-body gravitational waveforms for coalescing compact binaries with nonprecessing spins, tides, and self-spin effects

Abstract

We present TEOBResumS, a new effective-one-body (EOB) waveform model for nonprecessing (spinaligned) and tidally interacting compact binaries. Spin-orbit and spin-spin effects are blended together by making use of the concept of centrifugal EOB radius. The point-mass sector through merger and ringdown is informed by numerical relativity (NR) simulations of binary black holes (BBH) computed with the SpEC and BAM codes. An improved, NR-based phenomenological description of the postmerger waveform is developed. The tidal sector of TEOBResumS describes the dynamics of neutron star binaries up to merger and incorporates a resummed attractive potential motivated by recent advances in the post-Newtonian and gravitational self-force description of relativistic tidal interactions. Equation-of-state dependent self-spin interactions (monopole-quadrupole effects) are incorporated in the model using leading-order post-Newtonian results in a new expression of the centrifugal radius. TEOBResumS is compared to 135 SpEC and 19 BAM BBH waveforms. The maximum unfaithfulness to SpEC dataF -at design Advanced-LIGO sensitivity and evaluated with total mass M varying between 10M ≤ M ≤ 200M -is always below 2.5 × 10 −3 except for a single outlier that grazes the 7.1 × 10 −3 level. When compared to BAM data,F is smaller than 0.01 except for a single outlier in one of the corners of the NR-covered parameter space, that reaches the 0.052 level. TEOBResumS is also compatible, up to merger, to high end NR waveforms from binary neutron stars with spin effects and reduced initial eccentricity computed with the BAM and THC codes. The data quality of binary neutron star waveforms is assessed via rigorous convergence tests from multiple resolution runs and takes into account systematic effects estimated by using the two independent high-order NR codes. The model is designed to generate accurate templates for the analysis of LIGO-Virgo data through merger and ringdown. We demonstrate its use by analyzing the publicly available data for GW150914.PACS numbers: 04.25.D-, 04.30. Db, 95.30.Sf, 97.60.Jd

Kilohertz gravitational waves from binary neutron star remnants: Time-domain model and constraints on extreme matter

“…Currently, the only time-domain waveforms that can reproduce the merger peak amplitude are the effective-one-body (EOB) ones. We thus use the tidal EOB model developed in [82,90,93] and called TEOBResumS.…”

Factorization and resummation: A new paradigm to improve gravitational wave amplitudes. III. The spinning test-body terms

“…Test-mass results have been crucial to devise robust resummation techniques for the truncated post-Newtonian expansion that give access to analytical gravitational waveform and fluxes for circularized, nonprecessing, binaries [1][2][3][4][5]. Such resummed waveform, and related fluxes, are one of the crucial building blocks of effectiveone-body (EOB) waveform models for coalescing relativistic binaries [6][7][8][9][10][11]. Up to now, resummation of PN-expanded analytical result is the only approach that can be adopted to improve the behavior of the PNexpansions in the strong-field, fast velocity regime up to merger [12].…”

“…From the very beginning of this endeavor [1] the development (and testing) of resummation techniques has been driven by comparisons between some analytically resummed waveform and numerical waveforms (or fluxes) generated by a nonspinning particle inspiralling and plunging into a Schwarzschild or a Kerr black hole [13,14]. By contrast, none of the resummation approaches routinely used in state-of-the-art EOB models [8,11] has been tested in the special case where the particle (which models a test black-hole) is spinning. This was not done up to now for at least two reasons:…”

Inferring prompt black-hole formation in neutron star mergers from gravitational-wave data

“…Waveforms spanning from an initial GW frequency of 30 Hz to merger and corresponding to the binaries of Tab. I are constructed with the TEOBResumS waveform model [50,65]. Specifically, we use the nonspinning tidal model of [66] with gravitational-self-force resummed gravitoelectric and post-Newtonian gravitomagnetic terms (Model GSF23 (+) PN (−) with p = 4 of Tab.…”