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Generalized Wigner-Weyl calculus for gauge theory and nondissipative transport

Praveen D. Xavier* and M. A. Zubkov†

  • *Contact author: praveen.xavier@msmail.ariel.ac.il
  • †Contact author: zubkov.mike@gmail.com
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Phys. Rev. D 112, 056035 – Published 29 September, 2025

DOI: https://doi.org/10.1103/5h5v-jtfk

Abstract

We consider a theory of fermions interacting with a (in general, non-Abelian) gauge field. The theory is assumed to be essentially inhomogeneous, which might be provided by nontrivial background fields interacting with both fermions and gauge bosons. For this theory, a version of Wigner-Weyl calculus is developed, in which the Wigner transformation of the fermion Green function belongs to a matrix representation of the gauge group. We demonstrate the power of the proposed formalism through the representation of responses of vector and axial currents to the gauge field strength through the topological invariants composed of the Wigner transformed two-point Green functions. This way, a new family of nondissipative transport phenomena is introduced. In particular, we discuss the non-Abelian versions of the chiral separation effect and of the quantum Hall effect.

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Phys. Rev. D 112, 056035– Published 29 September, 2025
  • Received 19 June 2025
  • Accepted 11 August 2025
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