Approaching the Post-Newtonian Regime with Numerical Relativity: A Compact-Object Binary Simulation Spanning 350 Gravitational-Wave Cycles
2015
We present the first numerical-relativity simulation of a compact-object binary whose gravitational waveform
is long enough to cover the entire frequency band of advanced gravitational-wave detectors, such as LIGO,
Virgo and KAGRA, for mass ratio 7 and total mass as low as 45.5M_☉. We find that effective-one-body models,
either uncalibrated or calibrated against substantially shorter numerical-relativity waveforms at smaller mass
ratios, reproduce our new waveform remarkably well, with a negligible loss in detection rate due to modeling
error. In contrast, post-Newtonian inspiral waveforms and existing calibrated phenomenological inspiral-merger-ringdown waveforms display greater disagreement with our new simulation. The disagreement varies
substantially depending on the specific post-Newtonian approximant used.
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