Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collapsing Wormholes Sustained by Dustlike Matter   It is well known that static wormhole configurations in general relativity
(GR) are possible only if matter threading the wormhole throat is
"exotic"---i.e., violates a number of energy conditions. For this reason, it is
impossible to construct {static} wormholes supported only by dust-like matter
which satisfies all usual energy conditions. However, this is not the case for
non-static configurations. In 1934, Tolman found a general solution describing
the evolution of a spherical dust shell in GR. In this particular case,
Tolman's solution describes the collapsing dust ball; the inner space--time
structure of the ball corresponds to the Friedmann universe filled by a dust.
In the present work we use the general Tolman's solution in order to construct
a dynamic spherically symmetric wormhole solution in GR with dust-like matter.
The solution constructed represents the collapsing dust ball with the inner
wormhole space--time structure. It is worth noting that, with the dust-like
matter, the ball is made of satisfies the usual energy conditions and cannot
prevent the collapse. We discuss in detail the properties of the collapsing
dust wormhole.

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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: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-th
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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: q-fin
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The categories of this paper are: physics