Light charged fermions in quantum gravity

2020/10/31 by Gustavo P. de Brito, Astrid Eichhorn, Marc Schiffer
Physics and Astronomy · #Black Holes and Theoretical Physics #Fermion #Gauge anomaly #Gauge theory #Introduction to gauge theory #Noncommutative and Quantum Gravity Theories #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum #Quantum electrodynamics #Quantum gravity #Quantum mechanics #Theoretical physics #gr-qc #hep-ph #hep-th

paper · pdf · doi:10.1016/j.physletb.2021.136128

12 pages, 6 figures. Match the published version

openalex publication_date 2021/02/06 · arxiv created 2021/06/01 · arxiv updated 2021/06/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We study the impact of quantum gravity on a system of chiral fermions that are charged under an Abelian gauge group. Under the impact of quantum gravity, a finite value of the gauge coupling could be generated and in turn drive four-fermion interactions to criticality. We find indications that the gravity-gauge-fermion interplay protects the lightness of fermions for a large enough number of fermions. On the other hand, for a smaller number of fermions, chiral symmetry may be broken, which would be in tension with the observation of light fermions.

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