Predictive power of grand unification from quantum gravity

Understand

If a grand-unified extension of the asymptotically safe Reuter fixed-point for quantum gravity exists, it determines free parameters of the grand-unified scalar potential.

• All quartic couplings take their fixed-point values in the trans-Planckian regime.
• They are irrelevant parameters that are, in principle, computable for a given particle content of the grand unified model.
• In turn, the direction of spontaneous breaking of the grand-unified gauge symmetry becomes predictable.