https://doi.org/10.1140/epjc/s10052-025-13842-6
Regular Article - Theoretical Physics
Unveiling new phases of the Standard Model Higgs potential
Max-Planck-Institut für Kernphysik, P.O. Box 103980, 69029, Heidelberg, Germany
a
pastor@thphys.uni-heidelberg.de
Received:
4
December
2024
Accepted:
20
January
2025
Published online:
31
January
2025
We present evidence for new phases of the Standard Model Higgs potential. We study the Standard Model physical trajectory accounting for the Higgs curvature mass with the mass-dependent functional renormalisation group. New unstable and non-trivially stable phases are found at energies above the Planck scale and below the Abelian Landau pole. While the first aggravates the well-known metastable phase and threatens the viability of the Standard Model extrapolated to arbitrary scales, the latter can provide a well-defined ultraviolet completion. We investigate the phase diagram as a function of the top quark pole mass and study the effect of new physics through a scalar singlet portal coupling. The new non-trivial phase appears below the Planck scale in extensions of the Standard Model seeking stable trajectories. These findings have a significant impact on existing model building.
© The Author(s) 2025
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