Enabling Electroweak Baryogenesis through Dark Matter

Abstract

We study the impact on electroweak baryogenesis from a swifter cosmological expansion induced by dark matter. We detail the experimental bounds that one can place on models that realize it, and we investigate the modifications of these bounds that result from a non-standard cosmological history. The modifications can be sizeable if the expansion rate of the Universe increases by several orders of magnitude. We illustrate the impact through the example of scalar field dark matter, which can alter the cosmological history enough to enable a strong-enough first-order phase transition in the Standard Model when it is supplemented by a dimension six operator directly modifying the Higgs boson potential. We show that due to the modified cosmological history, electroweak baryogenesis can be realized, while keeping deviations of the triple Higgs coupling below HL-LHC sensitivies. The required scale of new physics to effectuate a strong-enough first order phase transition can change by as much as twenty percent as the expansion rate increases by six orders of magnitude.

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• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Big-Bang Nucleosynthesis
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• Constraining The Early-Universe Baryon Density And Expansion Rate
• Bose-Einstein-condensed scalar field dark matter and the gravitational wave background from inflation: new cosmological constraints and its detectability by LIGO
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• Gravitational wave signals and cosmological consequences of gravitational reheating
• Semi-analytic techniques for calculating bubble wall profiles
• Electroweak Baryogenesis and Dark Matter via a Pseudoscalar vs. Scalar
• The impact of non-minimally coupled gravity on vacuum stability
• Domain walls and gravitational waves in the Standard Model
• On Electroweak Phase Transition and Di-photon Excess with a 750 GeV Scalar Resonance
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• Higgs domain walls in the thermal background
• Fate of false vacuum in non-perturbative regimes: Gravity effects
• Non-minimally coupled gravity and vacuum stability