Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitational wave signatures in black-hole-forming core collapse   We present numerical simulations in general relativity of collapsing stellar
cores. Our initial model consists of a low metallicity rapidly-rotating
progenitor which is evolved in axisymmetry with the latest version of our
general relativistic code CoCoNuT, which allows for black hole formation and
includes the effects of a microphysical equation of state (LS220) and a
neutrino leakage scheme to account for radiative losses. The motivation of our
study is to analyze in detail the emission of gravitational waves in the
collapsar scenario of long gamma-ray bursts. Our simulations show that the
phase during which the proto-neutron star (PNS) survives before ultimately
collapsing to a black hole is particularly optimal for gravitational wave
emission. The high-amplitude waves last for several seconds and show a
remarkable quasi-periodicity associated with the violent PNS dynamics, namely
during the episodes of convection and the subsequent nonlinear development of
the standing-accretion shock instability (SASI). By analyzing the spectrogram
of our simulations we are able to identify the frequencies associated with the
presence of g-modes and with the SASI motions at the PNS surface. We note that
the gravitational waves emitted reach large enough amplitudes to be detected
with third-generation detectors as the Einstein Telescope within a Virgo
cluster volume at rates ~< 0.1 /y.

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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
2
The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: eess
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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: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin