Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ward-Takahashi Identidy on the Ligth-Front   The Ward-Takahashi identity, reflecting local gauge invariance, is
perturbatively verified for a boson model in light front field theory. A
careful integration over the light front energy, corresponding to exactly
taking into account pair terms, which are the contributions of the zero
longitudinal momentum mode, is crucial to obtain this result. Furthermore, the
one-loop boson form factors are calculated for arbitrary off-shell momenta.

5
The categories of this paper are: gr-qc
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The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
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The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
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The categories of this paper are: math