Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Toy Model for the Electromagnetic Output of Neutron-star Merger Prompt
  Collapse to a Black Hole: Magnetized Neutron-star Collisions   We present a systematic study of magnetised neutron star head on collisions.
We investigate the resulting magnetic field geometries as the two neutron stars
merge. Furthermore, we analyze the luminosity produced in these collisions and
monitor the evolution of the magnetic fields from the time of merger until the
subsequent production of a black hole. At the time of black hole formation the
luminosity peaks and rings-down following the decay of the electromagnetic
fields. A comparison is presented for three different cases, one where the
initial magnetic field in both neutron stars is aligned, one where they are
anti-aligned and also one case where they initially have unequal magnetic field
strength. We identify regions and set limits so that pair creation and magnetic
reconnection would occur in this scenario, and further discuss limits and
differences in the radiated energy. This study should be regarded as a toy
model of the case where the remnant, of a binary neutron star merger, undergoes
a prompt collapse to a black hole with a negligible surrounding disk. We note
that the generated electromagnetic pulses resembles the fast radio bursts
phenomenology. We consider implications on the high mass mergers leading to a
fast prompt collapse to a black hole and the expected flux to be observed at a
distance similar to the binary neutron star gravitational wave detection
GW190425.

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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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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: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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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: plasm-ph