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.
|Tidsskrift||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Status||Udgivet - 10. apr. 2021|
Bibliografisk noteFunding Information:
This work is supported by a research grant ( 29405 ) from Villum Fonden . Additionally, M. S. acknowledges support by the German Academic Scholarship Foundation and gratefully acknowledges hospitality at CP3-Origins, University of Southern Denmark, during final stages of this project. GPB is grateful for the support by CAPES under the grant no. 88881.188349 /2018-01 and CNPq no. 142049 /2016-6 and thanks the ITP at Heidelberg University for hospitality when this project was initiated. We gratefully acknowledge funding from the Heraeus-Stiftung for a research group retreat during which this project was developed.
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