Baryogenesis and leptogenesis from supercooled confinement

Abstract

We propose a framework of baryogenesis and leptogenesis that relies on a supercooled confining phase transition (PT) in the early universe. The baryon or lepton asymmetry is sourced by decays of hadrons of the strong dynamics after the PT, and it is enhanced compared to the non-confining case, which was the only one explored so far. This widens the energy range of the PT, where the observed baryon asymmetry can be reproduced, down to the electroweak scale. The framework then becomes testable with gravity waves (GW) at LISA and the Einstein Telescope. We then study two explicit realisations: one of leptogenesis from composite sterile neutrinos that realises inverse see-saw; one of baryogenesis from composite scalars that is partly testable by existing colliders and flavour factories.

Criterion for ultra-fast bubble walls: the impact of hydrodynamic obstruction

“…All the above-mentioned processes depend crucially on the regime of the bubble wall expansion, making the terminal velocity ξ w a key parameter. In recent years, ultrarelativistic bubble walls (bubbles expanding with a Lorentz factor γ w ≡ 1/ 1 − ξ 2 w ≫ 1) have been used for phenomenological studies on baryogenesis [40][41][42][43][44][45] and dark matter production [46][47][48][49][50]. For the application of ultrarelativistic bubble walls, it is extremely important to determine whether the bubble wall can enter into the ultrarelativistic regime or not [51].…”