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

Mihaylov, D., Ossokine, S., Buonanno, A., & Ghosh, A. (2021). Fast post-adiabatic waveforms in the time domain: Applications to compact binary coalescences in LIGO and Virgo. Physical Review D, 104(12): 124087. doi:10.1103/PhysRevD.104.124087.

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Mihaylov, Deyan1, Author           
Ossokine, Serguei1, Author           
Buonanno, Alessandra1, Author           
Ghosh, Abhirup1, Author           
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1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
 Abstract: We present a computationally efficient (time-domain) multipolar waveform model for quasi-circular 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 $2 - 100 M_{\odot}$. More specifically, for a low total-mass system, such as a binary neutron star with equal masses of $1.4 M_{\odot}$, like GW170817, the computational speedup is around 100 times; for an event with total mass $\sim 40 M_\odot$ and mass ratio $\sim 3$, like GW190412, the speedup is by a factor of $\sim 20$, while for a binary system of comparable masses and total mass of $\sim 70 M_{\odot}$, like GW150914, it is by a factor of $\sim 10$. 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.

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 Dates: 2021-05-142021
 Publication Status: Published in print
 Pages: 13 pages, 8 figures
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 Identifiers: arXiv: 2105.06983
DOI: 10.1103/PhysRevD.104.124087
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Title: Physical Review D
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Pages: - Volume / Issue: 104 (12) Sequence Number: 124087 Start / End Page: - Identifier: -