Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bispinor Auxiliary Fields in Duality-Invariant Electrodynamics
  Revisited: The U(N) Case   We update and detail the formulation of the duality-invariant systems of N
interacting abelian gauge fields with N auxiliary bispinor fields added. In
this setting, the self-duality amounts to U(N) invariance of the nonlinear
interaction of the auxiliary fields. The U(N) self-dual Lagrangians arise after
solving the nonlinear equations of motion for the auxiliary fields. We also
elaborate on a new extended version of the bispinor field formulation involving
some additional scalar auxiliary fields and study U(N) invariant interactions
with derivatives of the auxiliary bispinor fields. Such interactions generate
higher-derivative U(N) self-dual theories.

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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ph