Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Trivial Ghosts and Second Class Constraints   In a model in which a vector gauge field $W_\mu^a$ is coupled to an
antisymmetric tensor field $\phi_{\mu\nu}^a$ possessing a pseudoscalar mass, it
has been shown that all physical degrees of freedom reside in the vector field.
Upon quantizing this model using the Faddeev-Popov procedure, explicit
calculation of the two-point functions $<\phi\phi >$ and $<W \phi>$ at one-loop
order seems to have yielded the puzzling result that the effective action
generated by radiative effects has more physical degrees of freedom than the
original classical action. In this paper we point out that this is not in fact
a real effect, but rather appears to be a consequence of having ignored a
"ghost" field arising from the contribution to the measure in the path integral
arising from the presence of non-trivial second-class constraints. These ghost
fields couple to the fields $W_\mu^a$ and $\phi_{\mu\nu}^a$, which makes them
distinct from other models involving ghosts arising from second-class
constraints (such as massive Yang-Mills (YM) models) that have been considered,
as in these other models such ghosts decouple. As an alternative to dealing
with second class constraints, we consider introducing a "Stueckelberg field"
to eliminate second-class constraints in favour of first-class constraints and
examine if it is possible to then use the Faddeev-Popov quantization procedure.
In the Proca model, introduction of the Stueckelberg vector is equivalent to
the Batalin-Fradkin-Tyutin (BFT) approach to converting second-class
constraints to being first class through the introduction of new variables.
However, introduction of a Stueckelberg vector is not equivalent to the BFT
approach for the vector-tensor model. In an appendix, the BFT procedure is
applied to the pure tensor model and a novel gauge invariance is found.

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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: astro-ph
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat