Quantum-gravity predictions for the fine-structure constant
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 fo...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
10 July 2018
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| In: |
Physics letters
Year: 2018, Volume: 782, Pages: 198-201 |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2018.05.016 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1016/j.physletb.2018.05.016 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0370269318303800 
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| Author Notes: | Astrid Eichhorn, Aaron Held, Christof Wetterich |
| Summary: | 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. |
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| Item Description: | Gesehen am 11.11.2020 |
| Physical Description: | Online Resource |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2018.05.016 |