Quantum gravity and Standard-Model-like fermions

Understand

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.