Bonn 2020 – wissenschaftliches Programm

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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 10: Quantum Field Theory: gauge theories

MP 10.2: Vortrag

Mittwoch, 1. April 2020, 12:20–12:40, H-HS VII

Asymptotically safe QED — •Jobst Ziebell¹ and Holger Gies² — ¹TPI, FSU Jena, Germany — ²TPI, FSU Jena, Germany

High-energy completeness of Quantum electrodynamics (QED) can be induced by an interacting ultraviolet fixed point of the renormalization flow. We provide evidence for the existence of such fixed points in the subspace spanned by the gauge coupling, the electron mass and the Pauli spin-field coupling. Renormalization group trajectories emanating from the fixed point correspond to asymptotically safe theories that are free from the Landau pole problem. We analyse the set of fixed points, their stability properties with respect to a systematic expansion scheme, and compute high-energy complete flows towards the long-range physics. We observe the existence of a physical trajectory that matches the measured physical parameters in the infrared.