Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Traversable Wormholes in (2+1) and (3+1) Dimensions with a Cosmological
  Constant   Macroscopic traversable wormhole solutions to Einstein's field equations in
$(2+1)$ and $(3+1)$ dimensions with a cosmological constant are investigated.
Ensuring traversability severely constrains the material used to generate the
wormhole's spacetime curvature. Although the presence of a cosmological
constant modifies to some extent the type of matter permitted (for example it
is possible to have a positive energy density for the material threading the
throat of the wormhole in $(2+1)$ dimensions), the material must still be
``exotic'', that is matter with a larger radial tension than total mass-energy
density multiplied by $c^2$. Two specific solutions are applied to the general
cases and a partial stability analysis of a $(2+1)$ dimensional solution is
explored.

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The categories of this paper are: hep-ph
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The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
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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: math
6
The categories of this paper are: astro-ph
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The categories of this paper are: nlin
29
The categories of this paper are: funct-an
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The categories of this paper are: cs