Non-Relativistic Formation of Scalar Clumps as a Candidate for Dark Matter

Understand

We propose a new mechanism for the formation of dark matter clumps in the radiation era.

• We assume that a light scalar field is decoupled from matter and oscillates harmonically around its vacuum expectation value.
• We include self-interactions and consider the nonrelativistic regime.
• The scalar dynamics are described by a fluid approach where the fluid pressure depends on both quantum and self-interaction effects.