Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic Censorship Upheld in Spheroidal Collapse of Collisionless Matter   We study the collapse of spheroidal configurations of collisionless particles
in full general relativity. This setup was originally considered by Shapiro and
Teukolsky (1991), where it was found that prolate configurations with a
sufficiently large semimajor axis gave rise to diverging curvature, but no
apparent horizon. This was taken as evidence for the formation of a naked
singularity, in violation of cosmic censorship. We revisit such configurations
using different coordinates/slicing, and considering a range of values for the
semimajor axis and eccentricity of the initial matter distribution, and find
that the final state in all cases studied is a black hole plus gravitational
radiation. Though initially distorted, the proper circumferences of the
apparent horizons that are found do not significantly exceed the hoop
conjecture bound. Configurations with a larger semimajor axis can produce
strong gravitational radiation, with luminosities up to $P_{\rm GW}\sim 2\times
10^{-3}c^5/G$.

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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ph