Abstract: New strongly coupled dark sectors offer elegant solutions to
several open problems of the Standard Model, such as the nature of
Dark Matter, the origin of neutrino masses and the Strong CP Problem.
In this talk, I will explore some applications, including a model of
dark pion Dark Matter, where a dark topological theta term in the
Lagrangian induces new resonant processes. These allow to reproduce
the Dark Matter relic abundance while addressing the small-scale
problems of the Lambda-CDM model.