Connection between Cosmological Matter-Antimatter Asymmetry andCPNonconservation inKDecays

We suggest a scenario according to which the $\mathrm{CP}$-nonconserving interactions responsible for both the generation of matter-antimatter asymmetry in the universe and the microscopic process of $K_L\to 2\pi$ decay have a common origin at high energies. Consistency with the decoupling theorem is discussed. The general characteristics of gauge models that bring out this connection are outlined and a specific SO(10) model is discussed, where $\frac{n_B}{n_{\gamma }}$ and $\epsilon$ are related.