Constraints on discrete global symmetries in quantum gravity

Journal of High Energy Physics

Astrid Eichhorn¹  Martin Pauly²  Michael M. Scherer³  Passant Ali³ 

[1] CP3-Origins, University of Southern Denmark, Campusvej 55, DK-5230, Odense M, Denmark;Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120, Heidelberg, Germany;Institute for Theoretical Physics, University of Cologne, 50937, Cologne, Germany;

关键词: Models of Quantum Gravity;    Discrete Symmetries;    Global Symmetries;   

DOI  :  10.1007/JHEP05(2021)036

来源: Springer

【 摘 要 】

The question whether global symmetries can be realized in quantum-gravity-matter-systems has far-reaching phenomenological consequences. Here, we collect evidence that within an asymptotically safe context, discrete global symmetries of the form ℤn, n > 4, cannot be realized in a near-perturbative regime. In contrast, an effective-field-theory approach to quantum gravity might feature such symmetries, providing a mechanism to generate mass hierarchies in the infrared without the need for additional fine-tuning.

【 授权许可】

CC BY