Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Computation of Displacement and Spin Gravitational Memory in Numerical
  Relativity   We present the first numerical relativity waveforms for binary black hole
mergers produced using spectral methods that show both the displacement and the
spin memory effects. Explicitly, we use the SXS Collaboration's $\texttt{SpEC}$
code to run a Cauchy evolution of a binary black hole merger and then extract
the gravitational wave strain using $\texttt{SpECTRE}$'s version of a
Cauchy-characteristic extraction. We find that we can accurately resolve the
strain's traditional $m=0$ memory modes and some of the $m\not=0$ oscillatory
memory modes that have previously only been theorized. We also perform a
separate calculation of the memory using equations for the Bondi-Metzner-Sachs
charges as well as the energy and angular momentum fluxes at asymptotic
infinity. Our new calculation uses only the gravitational wave strain and two
of the Weyl scalars at infinity. Also, this computation shows that the memory
modes can be understood as a combination of a memory signal throughout the
binary's inspiral and merger phases, and a quasinormal mode signal near the
ringdown phase. Additionally, we find that the magnetic memory, up to numerical
error, is indeed zero as previously conjectured. Lastly, we find that
signal-to-noise ratios of memory for LIGO, the Einstein Telescope (ET), and the
Laser Interferometer Space Antenna (LISA) with these new waveforms and new
memory calculation are larger than previous expectations based on
post-Newtonian or Minimal Waveform models.

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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol