There are many reasons to believe in the existence of a strongly coupled dark sector. One of them is the observed similarity between the energy densities of dark matter and baryons, known as the dark matter–baryon coincidence problem. In this talk, I will explain why this comparability points toward an asymmetric strongly coupled dark sector at the QCD scale. I will further discuss...
We discuss how coherent scattering of dark matter with macroscopic targets can generate observable forces and lead to signals of equivalence principle violation. For dark matter masses around the eV scale, coherent enhancement in homogeneous or random materials opens new possibilities for torsion-balance experiments and related searches.