Patrick Valageas (IPhT CEA Saclay)

Some gravitational aspects of scalar field dark matter

Scalar field dark matter models (such as Fuzzy Dark Matter, axion-like particles, ultra-light DM) are interesting dark matter candidates. Their gravitational dynamics follow the usual CDM behaviours on large scales but differ on small scales because of wave effects or self-interactions. Focusing on scalar-field dark matter with non-negligible self-interactions, I will present two aspects of their gravitational dynamics: the formation of solitons, which could play a role for the tensions of CDM on galactic scales, and the accretion onto Black Holes, which could provide a probe of such DM clouds through gravitational waves.