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  Inferring the gravitational wave memory for binary coalescence events

Khera, N., Krishnan, B., Ashtekar, A., & De Lorenzo, T. (2021). Inferring the gravitational wave memory for binary coalescence events. Physical Review D, 103(4): 044012. doi:10.1103/PhysRevD.103.044012.

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Khera, Neev, Author
Krishnan, Badri1, Author              
Ashtekar, Abhay, Author
De Lorenzo, Tommaso, Author
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
 Abstract: Full, non-linear general relativity predicts a memory effect for gravitational waves. For compact binary coalescence, the total gravitational memory serves as an inferred observable, conceptually on the same footing as the mass and the spin of the final black hole. Given candidate waveforms for any LIGO event, then, one can calculate the posterior probability distribution functions for the total gravitational memory, and use them to compare and contrast the waveforms. In this paper we present these posterior distributions for the binary black hole merger events reported in the first Gravitational Wave Transient Catalog (GWTC-1), using the Phenomenological and Effective-One-Body waveforms. On the whole, the two sets of posterior distributions agree with each other quite well though we find larger discrepancies for the $\ell=2, m=1$ mode of the memory. This signals a possible source of systematic errors that was not captured by the posterior distributions of other inferred observables. Thus, the posterior distributions of various angular modes of total memory can serve as diagnostic tools to further improve the waveforms. Analyses such as this would be valuable especially for future events as the sensitivity of ground based detectors improves, and for LISA which could measure the total gravitational memory directly.

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 Dates: 2020-09-142021
 Publication Status: Published in print
 Pages: 15 pages, 6 figures
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 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 2009.06351
DOI: 10.1103/PhysRevD.103.044012
 Degree: -

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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 103 (4) Sequence Number: 044012 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: https://pure.mpg.de/cone/journals/resource/111088197762258