In this seminar, I present a study of the electroweak phase transition and baryogenesis in Composite Higgs models. In these scenarios, the Higgs arises from a new, strongly-coupled sector that confines near the TeV scale. The confinement phase transition is described in terms of the dilaton, the pseudo-Nambu-Goldstone boson of broken conformal invariance of the Composite Higgs sector. From the analysis of the joint Higgs-dilaton potential, I show that the electroweak phase transition can naturally be first-order, satisfying one key requirement for electroweak baryogenesis. I then discuss how a sufficient amount of CP violation – another key ingredient of baryogenesis – can be generated from quark Yukawa couplings which vary during the phase transition. Together this setup allows for successful electroweak baryogenesis. This scenario can be tested in complementary ways: in EDM experiments, by searching for dilaton production and deviations in Higgs couplings at colliders, and through gravitational waves at LISA.
