The weak-gravity bound and the need for spin in asymptotically safe matter-gravity models

Journal of High Energy Physics

Rafael Robson Lino dos Santos¹  Astrid Eichhorn¹  Gustavo P. de Brito¹ 

[1] CP3-Origins, University of Southern Denmark, Campusvej 55, DK-5230, Odense M, Denmark;

关键词: Global Symmetries;    Models of Quantum Gravity;    Renormalization Group;   

DOI  :  10.1007/JHEP11(2021)110

来源: Springer

【 摘 要 】

We discover a weak-gravity bound in scalar-gravity systems in the asymptotic-safety paradigm. The weak-gravity bound arises in these systems under the approximations we make, when gravitational fluctuations exceed a critical strength. Beyond this critical strength, gravitational fluctuations can generate complex fixed-point values in higher-order scalar interactions. Asymptotic safety can thus only be realized at sufficiently weak gravitational interactions. We find that within truncations of the matter-gravity dynamics, the fixed point lies beyond the critical strength, unless spinning matter, i.e., fermions and vectors, is also included in the model.

【 授权许可】

CC BY