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  Adding Gravitational Memory to Waveform Catalogs using BMS Balance Laws

Mitman, K., Iozzo, D., Khera, N., Boyle, M., De Lorenzo, T., Deppe, N., et al. (in preparation). Adding Gravitational Memory to Waveform Catalogs using BMS Balance Laws.

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2011.01309.pdf (Preprint), 2MB
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 Creators:
Mitman, Keefe, Author
Iozzo, Dante, Author
Khera, Neev, Author
Boyle, Michael, Author
De Lorenzo, Tommaso, Author
Deppe, Nils, Author
Kidder, Lawrence E., Author
Moxon, Jordan, Author
Pfeiffer, Harald P.1, Author              
Scheel, Mark A., Author
Teukolsky, Saul A., Author
Throwe, William, Author
Affiliations:
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: Accurate models of gravitational waves from merging binary black holes are crucial for detectors to measure events and extract new science. One important feature that is currently missing from the Simulating eXtreme Spacetimes (SXS) Collaboration's catalog of waveforms for merging black holes, and other waveform catalogs, is the gravitational memory effect: a persistent, physical change to spacetime that is induced by the passage of transient radiation. We find, however, that by exploiting the Bondi-Metzner-Sachs (BMS) balance laws, which come from the extended BMS transformations, we can correct the strain waveforms in the SXS catalog to include the missing displacement memory. Our results show that these corrected waveforms satisfy the BMS balance laws to a much higher degree of accuracy. Furthermore, we find that these corrected strain waveforms coincide especially well with the waveforms obtained from Cauchy-characteristic extraction (CCE) that already exhibit memory effects. These corrected strain waveforms also evade the transient junk effects that are currently present in CCE waveforms. Lastly, we make our code for computing these contributions to the BMS balance laws and memory publicly available as a part of the python package $\texttt{sxs}$, thus enabling anyone to evaluate the expected memory effects and violation of the BMS balance laws.

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 Dates: 2020-11-02
 Publication Status: Not specified
 Pages: 13 pages, 9 figures
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 2011.01309
 Degree: -

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