Cosmological constraints on macroscopic dark matter

The nature of dark matter is still a mystery. The possibility exists that dark matter is not made of elementary particles, but instead of “macroscopic”objects. In this class of scenarios, dubbed “macro DM”, the small interaction rates of dark matter are achieved through a small number density, as opposed to a small cross section. Examples of macro DM include clumps of strange quark matter ( “strangelets”), or primordial black holes. In our talk, after briefly reviewing the phenomenology of macro DM, we will discuss current constraints and prospects for future experiments.