Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Is it Physically Sound to Add a Topologically Massive Term to
  Three-Dimensional Massive Electromagnetic or Gravitational Models ?   The addition of a topologically massive term to an admittedly non-unitary
three-dimensional massive model, be it an electromagnetic system or a
gravitational one, does not cure its non-unitarity. What about the enlargement
of avowedly unitary massive models by way of a topologically massive term? The
electromagnetic models remain unitary after the topological augmentation but,
surprisingly enough, the gravitational ones have their unitarity spoiled. Here
we analyze these issues and present the explanation why unitary massive
gravitational models, unlike unitary massive electromagnetic ones, cannot
coexist from the viewpoint of unitarity with topologically massive terms. We
also discuss the novel features of the three-term effective field models that
are gauge-invariant.

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The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
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The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys