Abstract
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.
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Ali, P., Eichhorn, A., Pauly, M. et al. Constraints on discrete global symmetries in quantum gravity. J. High Energ. Phys. 2021, 36 (2021). https://doi.org/10.1007/JHEP05(2021)036
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DOI: https://doi.org/10.1007/JHEP05(2021)036