Shkerin, A.2017-07-102017-07-102017-07-10201710.1007/Jhep05(2017)155https://infoscience.epfl.ch/handle/20.500.14299/139070WOS:000402739100005We 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.Nonperturbative EffectsEffective Field Theoriestext::journal::journal article::research article