Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamic wormholes and Energy Conditions   A class of exact solutions of the Einstein field equations representing
non-static wormholes that obey the {\em weak and dominant energy conditions }
is presented. Hence, in principle, these wormholes can be built with less
exotic matter than the static ones.

9
The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
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The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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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: acc-phys
11
The categories of this paper are: hep-lat