Upper bound on the Abelian gauge coupling from asymptotic safety

• Verfasst von: Eichhorn, Astrid [VerfasserIn]
• Verfasst von: Versteegen, Fleur [VerfasserIn]
• Titel: Upper bound on the Abelian gauge coupling from asymptotic safety
• Verf.angabe: Astrid Eichhorn, Fleur Versteegen
• E-Jahr: 2018
• Jahr: 09 January 2018
• Umfang: 29 S.
• Fussnoten: Gesehen am 02.08.2019
• Titel Quelle: Enthalten in: Journal of high energy physics
• Ort Quelle: Berlin : Springer, 1997
• Jahr Quelle: 2018
• Band/Heft Quelle: (2018), 1, Artikel-ID 30, Seite 1-29
• ISSN Quelle: 1029-8479
• DOI: doi:10.1007/JHEP01(2018)030
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Models of Quantum Gravity
• Sach-SW: Nonperturbative Effects
• Sach-SW: Renormalization Group
• K10plus-PPN: 1670500721

Abstract

We explore the impact of asymptotically safe quantum gravity on the Abelian gauge coupling in a model including a charged scalar, confirming indications that asymptotically safe quantum fluctuations of gravity could trigger a power-law running towards a free fixed point for the gauge coupling above the Planck scale. Simultaneously, quantum gravity fluctuations balance against matter fluctuations to generate an interacting fixed point, which acts as a boundary of the basin of attraction of the free fixed point. This enforces an upper bound on the infrared value of the Abelian gauge coupling. In the regime of gravity couplings which in our approximation also allows for a prediction of the top quark and Higgs mass close to the experimental value [1], we obtain an upper bound approximately 35% above the infrared value of the hypercharge coupling in the Standard Model.