Abstract
There are indications that an asymptotically safe UV completion of the Standard Model with gravity could constrain the Higgs self-coupling, resulting in a prediction of the Higgs mass close to the vacuum stability bound in the Standard Model. The predicted value depends on the top quark mass and comes out somewhat higher than the experimental value if the current central value for the top quark mass is assumed. Beyond the Standard Model, the predicted value also depends on dark fields coupled through a Higgs portal. Here we study the Higgs self-coupling in a toy model of the Standard Model with quantum gravity that we extend by a dark scalar and fermion. Within the approximations used in [1], there is a single free parameter in the asymptotically safe dark sector, as a function of which the predicted (toy model) Higgs mass can be lowered due to mixing effects if the dark sector undergoes spontaneous symmetry breaking.
Highlights
A different perspective on the question of stability is provided by the map between the value of the quartic coupling at microscopic scales and the Higgs mass
We study the Higgs self-coupling in a toy model of the Standard Model with quantum gravity that we extend by a dark scalar and fermion
The results reviewed above are obtained with functional Renormalization Group (RG) (FRG) techniques that we rely on in this paper
Summary
Quantum fluctuations render couplings in a quantum field theory dependent on the energy scale. In the Wilsonian functional RG approach to renormalization one integrates out these fluctuations momentum-shell-wise from high to low energy scales. The resulting dependence on the energy scale k is encoded in the beta functions βg = k∂kg for a dimensionless coupling g = gk−dg. Dg is the canonical mass dimension of the dimensionful coupling g
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