Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Memory Effect and BMS-like Symmetries for Impulsive Gravitational Waves   Cataclysmic astrophysical phenomena can produce impulsive gravitational waves
that can possibly be detected by the advanced versions of present-day detectors
in the future. Gluing of two spacetimes across a null surface produces
impulsive gravitational waves (in the phraseology of Penrose [1]) having a
Dirac Delta function type pulse profile along the surface. It is known that
BMS-like symmetries appear as soldering freedom while we glue two spacetimes
along a null surface. In this note, we study the effect of such impulsive
gravitational waves on test particles (detectors) or geodesics. We show
explicitly some measurable effects that depend on BMS-transformation parameters
on timelike and null geodesics. BMS-like symmetry parameters carried by the
gravitational wave leave some "memory" on test geodesics upon passing through
them.

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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: dg-ga