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  Fast extreme-mass-ratio-inspiral waveforms: New tools for millihertz gravitational-wave data analysis

Katz, M., Chua, A. J. K., Speri, L., Warburton, N., & Hughes, S. A. (2021). Fast extreme-mass-ratio-inspiral waveforms: New tools for millihertz gravitational-wave data analysis. Physical Review D, 104(6): 064047. doi:10.1103/PhysRevD.104.064047.

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 Creators:
Katz, Michael1, Author              
Chua, Alvin J. K., Author
Speri, Lorenzo1, Author              
Warburton, Niels, Author
Hughes, Scott A., 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 the FastEMRIWaveforms (FEW) package, a collection of tools to build and analyze extreme mass ratio inspiral (EMRI) waveforms. Here, we expand on the Physical Review Letter that introduced the first fast and accurate fully-relativistic EMRI waveform template model. We discuss the construction of the overall framework; constituent modules; and the general methods used to accelerate EMRI waveforms. Because the fully relativistic FEW model waveforms are for now limited to eccentric orbits in the Schwarzschild spacetime, we also introduce an improved Augmented Analytic Kludge (AAK) model that describes generic Kerr inspirals. Both waveform models can be accelerated using graphics processing unit (GPU) hardware. With the GPU-accelerated waveforms in hand, a variety of studies are performed including an analysis of EMRI mode content, template mismatch, and fully Bayesian Markov Chain Monte Carlo-based EMRI parameter estimation. We find relativistic EMRI waveform templates can be generated with fewer harmonic modes ($\sim10-100$) without biasing signal extraction. However, we show for the first time that extraction of a relativistic injection with semi-relativistic amplitudes can lead to strong bias and anomalous structure in the posterior distribution for certain regions of parameter space.

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 Dates: 2021-04-092021
 Publication Status: Published in print
 Pages: 26 pages, 12 Figures, FastEMRIWaveforms Package: bhptoolkit.org/FastEMRIWaveforms/
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 Identifiers: arXiv: 2104.04582
DOI: 10.1103/PhysRevD.104.064047
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Title: Physical Review D
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Pages: - Volume / Issue: 104 (6) Sequence Number: 064047 Start / End Page: - Identifier: -