Quantum-gravity predictions for the fine-structure constant

• Verfasst von: Eichhorn, Astrid [VerfasserIn]
• Verfasst von: Held, Aaron [VerfasserIn]
• Verfasst von: Wetterich, Christof [VerfasserIn]
• Titel: Quantum-gravity predictions for the fine-structure constant
• Verf.angabe: Astrid Eichhorn, Aaron Held, Christof Wetterich
• E-Jahr: 2018
• Jahr: 10 July 2018
• Umfang: 4 S.
• Fussnoten: Gesehen am 11.11.2020
• Titel Quelle: Enthalten in: Physics letters / B
• Ort Quelle: Amsterdam : North-Holland Publ., 1967
• Jahr Quelle: 2018
• Band/Heft Quelle: 782(2018), Seite 198-201
• ISSN Quelle: 1873-2445
• DOI: doi:10.1016/j.physletb.2018.05.016
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1584090375

Abstract

Asymptotically safe quantum fluctuations of gravity can uniquely determine the value of the gauge coupling for a large class of grand unified models. In turn, this makes the electromagnetic fine-structure constant calculable. The balance of gravity and matter fluctuations results in a fixed point for the running of the gauge coupling. It is approached as the momentum scale is lowered in the transplanckian regime, leading to a uniquely predicted value of the gauge coupling at the Planck scale. The precise value of the predicted fine-structure constant depends on the matter content of the grand unified model. It is proportional to the gravitational fluctuation effects for which computational uncertainties remain to be settled.