Minimum mass of galaxies from BEC or scalar field dark matter

TL;DR

This paper proposes that ultra-light scalar particles in Bose-Einstein condensate form can explain the observed common central mass of Milky Way satellites, addressing issues in cold dark matter models.

Contribution

It demonstrates that the finite length scale of BEC dark matter particles can account for satellite mass observations independently of luminosity.

Findings

Scalar field dark matter with particle mass ~10^{-22} eV explains satellite masses.

Finite length scale of BEC dark matter alleviates cusp and missing satellite problems.

Consistent with observed common central mass of Milky Way satellites.

Abstract

Many problems of cold dark matter models such as the cusp problem and the missing satellite problem can be alleviated, if galactic halo dark matter particles are ultra-light scalar particles and in Bose-Einstein condensate (BEC), thanks to a characteristic length scale of the particles. We show that this finite length scale of the dark matter can also explain the recently observed common central mass of the Milky Way satellites ($\sim 10^7 M_\odot$) independent of their luminosity, if the mass of the dark matter particle is about $10^{-22} eV$.