Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gauge (In)variance, Mass and Parity in D=3 Revisited   We analyze the degree of equivalence between abelian topologically massive,
gauge-invariant, vector or tensor parity doublets and their explicitly massive,
non-gauge, counterparts. We establish equivalence of field equations by
exploiting a generalized Stueckelberg invariance of the gauge systems. Although
the respective excitation spectra and induced source-source interactions are
essentially identical, there are also differences, most dramatic being those
between the Einstein limits of the interactions in the tensor case: the
doublets avoid the discontinuity (well-known from D=4) exhibited by Pauli-Fierz
theory.

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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: cs
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
2
The categories of this paper are: math
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org