Fast post-adiabatic waveforms in the time domain: Applications to compact binary coalescences in LIGO and Virgo

We present a computationally efficient (time-domain) multipolar waveform model for quasicircular spin-aligned compact binary coalescences. The model combines the advantages of the numerical-relativity informed, effective-one-body (EOB) family of models with a post-adiabatic solution of the equations of motion for the inspiral part of the two-body dynamics. We benchmark this model against other state-of-the-art waveforms in terms of efficiency and accuracy. We find a speed-up of one to two orders of magnitude compared to the underlying time-domain eob model for the total mass range 2--100 M_. More specifically, for a low total-mass system, such as a binary neutron star with equal masses of 1. 4 M_, like GW170817, the computational speedup is around 100 times; for an event with total mass 40 M_ and mass ratio 3, like GW190412, the speedup is by a factor of 20, while for a binary system of comparable masses and total mass of 70 M_, like GW150914, it is by a factor of 10. We demonstrate that the new model is extremely faithful to the underlying eob model with unfaithfulness less than 0. 01% across the entire applicable region of parameter space. Finally, we present successful applications of this new waveform model to parameter estimation studies and tests of general relativity.