Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for post-merger gravitational waves from the remnant of the
  binary neutron star merger GW170817   The first observation of a binary neutron star coalescence by the Advanced
LIGO and Advanced Virgo gravitational-wave detectors offers an unprecedented
opportunity to study matter under the most extreme conditions. After such a
merger, a compact remnant is left over whose nature depends primarily on the
masses of the inspiralling objects and on the equation of state of nuclear
matter. This could be either a black hole or a neutron star (NS), with the
latter being either long-lived or too massive for stability implying delayed
collapse to a black hole. Here, we present a search for gravitational waves
from the remnant of the binary neutron star merger GW170817 using data from
Advanced LIGO and Advanced Virgo. We search for short ($\lesssim1$ s) and
intermediate-duration ($\lesssim 500$ s) signals, which includes
gravitational-wave emission from a hypermassive NS or supramassive NS,
respectively. We find no signal from the post-merger remnant. Our derived
strain upper limits are more than an order of magnitude larger than those
predicted by most models. For short signals, our best upper limit on the
root-sum-square of the gravitational-wave strain emitted from 1--4 kHz is
$h_{\rm rss}^{50\%}=2.1\times 10^{-22}$ Hz$^{-1/2}$ at 50% detection
efficiency. For intermediate-duration signals, our best upper limit at 50%
detection efficiency is $h_{\rm rss}^{50\%}=8.4\times 10^{-22}$ Hz$^{-1/2}$ for
a millisecond magnetar model, and $h_{\rm rss}^{50\%}=5.9\times 10^{-22}$
Hz$^{-1/2}$ for a bar-mode model. These results indicate that post-merger
emission from a similar event may be detectable when advanced detectors reach
design sensitivity or with next-generation detectors.

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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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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: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin