http://arxiv.org/abs/2201.12418
We assume dark matter (DM) to be a Bose–Einstein condensate (BEC) of nonrelativistic ultralight scalar particles with repulsive contact interactions. Such model predicts cored halos with rotation curves that obey a universal equation in the inner region. A simultaneous fit to a selection of galaxies from the SPARC database chosen with the sole criterion of being strongly DM dominated even within $r \lesssim 1$ kpc, shows that the data are consistent with the presence of a BEC of particles of mass $m \simeq 2.2 \times 10^{-22}$ eV/c$^2$ and repulsive interactions characterized by a scattering length $a_s \simeq 7.8 \times 10^{-77}$ m. Such small interactions induce a natural minimum scale length for the size of DM structures that makes all cores similar in length ($\sim 1$ kpc) and contributes to lower their central densities.
V. Delgado and A. Mateo
Tue, 1 Feb 22
60/73
Comments: 9 pages, 5 figures