Seminarium "Teoria cząstek elementarnych i kosmologia"

In the first part of the seminar, we will use unitarity and the optical theorem to build an effective theory that simultaneously explains the matter–antimatter asymmetry via leptogenesis, the dark matter relic abundance via freeze-in or freeze-out mechanisms, and neutrino masses via the Weinberg operator. We will show that, in a minimal scenario, only two new particles and a single portal operator coupling the visible and dark sectors are sufficient beyond the Standard Model. In the second part, we will focus on interpreting the non‑standard asymmetry contributions which, as we demonstrate, must be included. We will present an algorithm designed to avoid the most common mistakes and inconsistencies when calculating an asymmetry source term in the Boltzmann equation.