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• W2894500895 abstract "The functional renormalisation group for the Einstein-Hilbert action is investigated for the case of four infinite (or large) and one compact dimension. The motivation for this study is given by the suggestion that gravity in more than four dimensions might be able to solve the so-called hierarchy problem of the Standard Model of elementary particle physics because the assumed extra dimensions allow to unify the true Planck scale with the electroweak scale. In a first step the Einstein-Hilbert theory for the functional renormalisation group treatment of Quantum Gravity is introduced. To set the scene for the following investigation including a compact dimension first some corresponding calculations for four and more large dimensions are performed and the results are found to be in agreement with already known ones. The equations determining the renormalisation group flows are then derived for the case of one compact dimension. These dimensionally reduced renormalisation group equations are then numerically solved for the case of four large and one compact dimension. Results for the four- to five-dimensional crossover are then discussed employing two forms of the background field flow in the Einstein-Hilbert theory for the case of one extra compact dimension. Renormalisation group trajectories allowing for a significant lowering of the true Planck scale to the electroweak scale are identified. The behaviour of the running gravitational coupling at the four- to five-dimensional crossover and the true Planck scale is displayed. Potential phenomenological implications are briefly discussed." @default.
• W2894500895 created "2018-10-05" @default.
• W2894500895 creator A5017631436 @default.
• W2894500895 date "2018-09-23" @default.
• W2894500895 modified "2023-09-27" @default.
• W2894500895 title "Renormalisation Group for Gravity and Dimensional Reduction" @default.
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• W2894500895 hasPublicationYear "2018" @default.
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