Electroweak vacuum stability in the Higgs-Dilaton theory

Abstract

We study the stability of the Electroweak (EW) vacuum in a scale-invariant extension of the Standard Model and General Relativity, known as a Higgs-Dilaton theory. The safety of the EW vacuum against possible transition towards another vacuum is a necessary condition for the model to be phenomenologically acceptable. We find that, within a wide range of parameters of the theory, the decay rate is significantly suppressed compared to that of the Standard Model. We also discuss properties of a tunneling solution that are specific to the Higgs-Dilaton theory.

16 pages, 5 figures

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• Quantum scale invariance, cosmological constant and hierarchy problem
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• Higgs-Dilaton Cosmology: An inflation - dark energy connection and forecasts for future galaxy surveys
• Gravity, Scale Invariance and the Hierarchy Problem
• Scale and Weyl Invariance in Einstein-Cartan Gravity
• Scale-invariant alternatives to general relativity. III. The inflation--dark-energy connection
• Asymptotic Scale Invariance and its Consequences
• Dilaton-assisted generation of the Fermi scale from the Planck scale