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QED coupled to QEG

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Abstract

We discuss the non-perturbative renormalization group flow of Quantum Electrodynamics (QED) coupled to Quantum Einstein Gravity (QEG) and explore the possibilities for defining its continuum limit at a fixed point that would lead to a non-trivial, i.e. interacting field theory. We find two fixed points suitable for the Asymptotic Safety construction. In the first case, the fine-structure constant α vanishes at the fixed point and its infrared (“renormalized”) value is a free parameter not determined by the theory itself. In the second case, the fixed point value of α is non-zero, and its infrared value is a computable prediction of the theory.

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  1. Institute of Physics, University of Mainz, Staudingerweg 7, D-55099, Mainz, Germany

    U. Harst & M. Reuter

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  1. U. Harst
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ArXiv ePrint: 1101.6007

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Harst, U., Reuter, M. QED coupled to QEG. J. High Energ. Phys. 2011, 119 (2011). https://doi.org/10.1007/JHEP05(2011)119

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