Speaker
Description
We present a class of composite dark matter models with matter fields in a real representation under the non abelian gauge group. As an exemplary theory we present an Sp(4) gauge theory, with fermions transforming in the antisymmetric representation. We analyze the structure of these theories in the UV and discuss the building blocks of the low energy effective theory in the IR, describing the dynamics of the cold dark matter. We put special focus on the construction of topological terms responsible for 3→2 cannibalization processes within the dark sector and on the physics of the pseudo scalar singlet related to the axial anomaly. We show that both these aspects significantly affect the freeze out calculation of the dark matter relic abundance and thus are relevant for investigations of the parameter space of such theories.
