English

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

General Relativity and Quantum Cosmology 2018-12-05 v2

Abstract

We present TEOBResumS, a new effective-one-body (EOB) waveform model for nonprecessing (spin-aligned) 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 data Fˉ\bar{F} -- at design Advanced-LIGO sensitivity and evaluated with total mass MM varying between 10MM200M10M_\odot \leq M \leq 200 M_\odot --is always below 2.5×1032.5 \times 10^{-3} except for a single outlier that grazes the 7.1×1037.1 \times 10^{-3} level. When compared to BAM data, Fˉ\bar{F} is smaller than 0.010.01 except for a single outlier in one of the corners of the NR-covered parameter space, that reaches the 0.0520.052 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 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.

Keywords

Cite

@article{arxiv.1806.01772,
  title  = {Time-domain effective-one-body gravitational waveforms for coalescing compact binaries with nonprecessing spins, tides and self-spin effects},
  author = {Alessandro Nagar and Sebastiano Bernuzzi and Walter Del Pozzo and Gunnar Riemenschneider and Sarp Akcay and Gregorio Carullo and Philipp Fleig and Stanislav Babak and Ka Wa Tsang and Marta Colleoni and Francesco Messina and Geraint Pratten and David Radice and Piero Rettegno and Michalis Agathos and Edward Fauchon-Jones and Mark Hannam and Sascha Husa and Tim Dietrich and Pablo Cerda-Duran and Jose A. Font and Francesco Pannarale and Patricia Schmidt and Thibault Damour},
  journal= {arXiv preprint arXiv:1806.01772},
  year   = {2018}
}

Comments

39 pages, 36 figures. Extended appendix with discussion of the postmerger fits. Version accepted for publication in Phys. Rev. D