Quantum gravity and Standard-Model-like fermions

A. Eichhorn, S. Lippoldt

Research output: Contribution to journalJournal articleResearchpeer-review


We discover that chiral symmetry does not act as an infrared attractor of the renormalization group flow under the impact of quantum gravity fluctuations. Thus, observationally viable quantum gravity models must respect chiral symmetry. In our truncation, asymptotically safe gravity does, as a chiral fixed point exists. A second non-chiral fixed point with massive fermions provides a template for models with dark matter. This fixed point disappears for more than 10 fermions, suggesting that an asymptotically safe ultraviolet completion for the standard model plus gravity enforces chiral symmetry.

Original languageEnglish
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Pages (from-to)142-146
Publication statusPublished - 2017
Externally publishedYes


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