Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Curious Case of an Effective Theory   We describe an effective theory of a scalar field, motivated by some features
expected in the low energy theory of gluodynamics in 3+1 dimensions. The theory
describes two propagating massless particles in a certain limit, which we
identify with the Abelian QED limit, and has classical string solutions in the
general case. The string solutions are somewhat unusual as they are multiply
degenerate due to spontaneous breaking of diffeomorphism invariance.
Nevertheless all solutions yield identical electric field and have the same
string tension.

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The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc