Hall 123

Some applications of S-matrix Unitarity in Particle Cosmology

Satyanarayan Mukhopadhyay

IACS Kolkata

In this pedagogical blackboard talk, I shall discuss three implications of S-matrix Unitarity in Particle Cosmology -- (1) in setting the maximum mass of thermal dark matter with a dominant n->2 number changing annihilation, with n>=2; (2) the
Nanopoulos-Weinberg theorem in baryogenesis and leptogenesis and (3) Unitarity sum rules for CP violating thermal scattering rates.