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  • Open Access

Momentum space entanglement of four fermion field theory

Weijun Kong

Qing Wang

  • Department of Physics, Tsinghua University, Beijing 100084, People’s Republic of China and Center for High Energy Physics, Tsinghua University, Beijing 100084, People’s Republic of China

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Phys. Rev. D 112, 105003 – Published 7 November, 2025

DOI: https://doi.org/10.1103/326l-kl71

Abstract

Momentum space entanglement of four fermion field theory is calculated from the Wilsonian effective action pertubatively using replica trick, local terms in low energy effective action are proved to be nonrelevant pertubatively, and nonlocal terms are the only source of entanglement between different momentum modes. The final result can be represented by a set of basketball Feynman diagrams with new Feynman rules proposed to interpret them.

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Phys. Rev. D 112, 105003– Published 7 November, 2025
  • Received 28 May 2025
  • Accepted 9 October 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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