http://arxiv.org/abs/2203.01525
The predicted size of dark matter substructures in kilo-parsec scales is model-dependent. Therefore, if the correlations between dark matter mass densities, as a function of the distances between them, are measured via observations, we can scrutinize dark matter scenarios. In this paper, we use Gaia’s data to infer the single-body phase-space density of the stars in the Fornax dwarf spheroidal galaxy. The latter together with the Jeans equation, after eliminating the gravitational potential using the Poisson equation, reveals the mass density of dark matter as a function of its position in the galaxy. We derive the correlations between dark matter mass densities as a function of distances between them. For distances beyond 100 parsec, no statistically significant correlation is observed. We use the results to limit the parameter space of the Ginzburg-Landau statistical field theory of dark matter mass densities, and subsequently shrink the parameter space of (i) a classic gas dark matter and (ii) a superfluid dark matter. Our results can be used to leave bounds on high-resolution N-body simulations by comparing the correlations computed using their outputs and the measured ones via observations.
A. Borzou
Fri, 4 Mar 22
28/63
Comments: 11 pages, 6 figures