Dark photons and tachyonic instability induced by Barbero–Immirzi parameter and axion–torsion transmutation

Abstract In this paper, we investigate Holst gravity by examining two different examples. The first example involves minimal coupling to torsion, while the second explores non-minimal coupling. The motivation for the first example stems from the recent work by Dombriz et al. (Phys Lett B 834:137488,...

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Bibliographic Details
Main Authors: Zhi-Fu Gao, Biaopeng Li, L. C. Garcia de Andrade
Format: Article
Language:English
Published: SpringerOpen 2025-04-01
Series:European Physical Journal C: Particles and Fields
Online Access:https://doi.org/10.1140/epjc/s10052-025-14065-5
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