Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Universality of the turbulent magnetic field in hypermassive neutron
  stars produced by binary mergers   The detection of a binary neutron star merger in 2017 through both
gravitational waves and electromagnetic emission opened a new era of
multimessenger astronomy. The understanding of the magnetic field amplification
triggered by the Kelvin-Helmholtz instability during the merger is still a
numerically unresolved problem because of the relevant small scales involved.
One of the uncertainties comes from the simplifications usually assumed in the
initial magnetic topology of merging neutron stars. We perform high-resolution,
convergent large-eddy simulations of binary neutron star mergers, following the
newly formed remnant for up to $30$ milliseconds. Here we specifically focus on
the comparison between simulations with different initial magnetic
configurations, going beyond the widespread-used aligned dipole confined within
each star. The results obtained show that the initial topology is quickly
forgotten, in a timescale of few miliseconds after the merger. Moreover, at the
end of the simulations, the average intensity ($B\sim 10^{16}$ G) and the
spectral distribution of magnetic energy over spatial scales barely depend on
the initial configuration. This is expected due to the small-scale efficient
dynamo involved, and thus it holds as long as: (i) the initial large-scale
magnetic field is not unrealistically high (as often imposed in mergers
studies); (ii) the turbulent instability is numerically (at least partially)
resolved, so that the amplified magnetic energy is distributed across a wide
range of scales and becomes orders-of-magnitude larger than the initial one.

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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: cs