Baryogenesis

TL;DR

These lectures comprehensively survey baryogenesis, tracing observational evidence for a nonzero BAU and the theoretical framework of Sakharov’s conditions. They compare GUT-scale baryogenesis with electroweak baryogenesis, detailing how B and CP violation, plus a departure from equilibrium, operate across SM and beyond-SM scenarios, including 2HDM, MSSM, and NMSSM. The discussion emphasizes the challenge of achieving a strong first-order electroweak phase transition and controlling CP-violating sources within experimental EDM bounds, while highlighting leptogenesis as a compelling high-scale alternative tied to neutrino masses via the seesaw mechanism. The work delineates the viability, constraints, and experimental implications of these mechanisms, guiding future collider and EDM searches as tests of baryogenesis theories.

Abstract

Pedagogical lectures on baryogenesis, with emphasis on the electroweak phase transition and electroweak baryogenesis. Contents: (1) Observational evidence for the BAU; (2) Sakharov's conditions for baryogenesis; (3) Example: GUT baryogenesis; (4) B and CP violation in the standard model; (5) Electroweak phase transition and electroweak baryogenesis; (6) A model of electroweak baryogenesis: the two Higgs doublet model; (7) EWBG in the MSSM; (8) Leptogenesis

Figures (24)

• Figure 2: Dependence of the CMB Doppler peaks on $\eta$.
• Figure 3: Number of publications on baryogenesis as a function of time.
• Figure 4: The sphaleron.
• Figure 5: GUT couplings
• Figure 6: Tree plus 1-loop contributions to $Y\to e_R u_R$