Theories of Baryogenesis

Abstract

These lectures provide a pedagogical review of the present status of theories explaining the observed baryon asymmetry of the Universe. Particular emphasis is given on GUT baryogenesis and electroweak baryogenesis. The key issues, the unresolved problems and the very recent developments, such as GUT baryogenesis during preheating, are explained. Some exercises (and their solution) are also provided.

Figures (12)

• Figure 1: Couplings of $X$ and $Y$ to fermions $f_i$.
• Figure 2: One-loop corrections to the Born amplitude of Fig. 1.
• Figure 3: Intereference between the diagrams of Fig. 1 and Fig. 2 for the square amplitudes of $X$ decay.
• Figure 4: The variance of $X$ with model parameters $q=10^6$, $m_\chi=2$, and $\Gamma \equiv \Gamma_X/M_\phi=6\times10^{-2}$ is shown by the lower solid curve as a function of time. The upper solid curve corresponds to the inflaton zero mode. The dotted curves represent the same quantities for $\Gamma =0$.
• Figure 5: The maximum value of the variance of the $X$-field, $\langle X_{\rm max}^2 \rangle$, is shown as function of $\Gamma$. Stars mark $\langle X_{\rm max}^2\rangle$ obtained in the full non-linear problem. $\langle X_{\rm max}^2\rangle$ in the Hartree approximation is shown by the dotted curve for $q=10^4$, $m_\chi=0.1$, and by the solid curve for $q=10^6$, $m_\chi=2$.