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Kinetic coupling and dark matter on the lattice

K. Farakos, V. Iconomou, and G. Koutsoumbas

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Phys. Rev. D 112, 094507 – Published 17 November, 2025

DOI: https://doi.org/10.1103/3shp-gcyh

Abstract

We study a U(1)⊗U(1) system coupled to scalar fields. Initially, the model is studied in a novel continuum formulation and study of the appropriate diagonalizations is performed. Three models are examined, in two of which the scalar field couples with both gauge fields while in the third one the scalar field couples only to the dark photon. The model is then treated on a space-time lattice. We determine the phase diagram for various values of the kinetic coupling parameter. Then there follows the determination of masses for the scalar fields and the massive gauge fields, as well as the fine structure constants for the massless gauge fields.

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Phys. Rev. D 112, 094507– Published 17 November, 2025
  • Received 2 July 2025
  • Accepted 15 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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