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CQG: A Link between Asymptotically Safe Quantum Gravity and the Standard Model

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Aaron Held, University of Heidelberg
When
10 April 2018 from 10:00 AM to 11:00 AM
Where
320 Whitmore Lab
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Renormalization Group flows provide a link between Planck- and electroweak-scale physics, that could allow testing implications of quantum gravity at accessible energy scales. Systematic truncations suggest the existence of a UV scaling regime of asymptotically safe quantum gravity, in which gravity fluctuations UV-complete the matter sector. Within this scenario, the paradigm of asymptotic safety surpasses the predictive power of the Standard Model. It could give an explanation for the Abelian gauge coupling and quark masses from first principles in a microscopic model including quantum gravity. Assuming no new physics below the Planck scale, we construct explicit renormalization Group trajectories for Standard Model and gravitational couplings which link the transplanckian regime to the electroweak scale and yield a top pole mass of approximately 170 GeV. In our approximation, quantitative agreement with observations points towards an electric charge ratio of bottom and top in close vicinity to the Standard-Model value of Qb/Qt=-1/2

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