2012/11/30 by Alma X. Gonzalez-Morales, Alma X González-Morales, Octavio Valenzuela +2 · 2 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark fluid #Dark matter #Dark matter halo #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hot dark matter #Mass distribution #Scalar field dark matter #Solar System #astro-ph.CO
paper · pdf · doi:10.1088/1475-7516/2013/03/001
published as JCAP03(2013)001 · 28 pages. Accepted for publication in JCAP. Changes in response to referee's comments: Section 3.2.1 and referecenses added
arxiv created 2013/02/07 · openalex publication_date 2013/03/01 · arxiv updated 2013/03/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The accuracy of the measurements of some astrophysical dynamical systems allows to constrain the existence of incredibly small gravitational perturbations. In particular, the internal Solar System dynamics (planets, Earth-Moon) opens up the possibility, for the first time, to prove the abundance, mass and size, of dark sub-structures at the Earth vicinity. We find that adopting the standard dark matter density, its local distribution can be composed by sub-solar mass halos with no currently measurable dynamical consequences, regardless of the mini-halo fraction. On the other hand, it is possible to exclude the presence of dark streams with linear mass densities higher than λ st > 10 −10 M ☉ /AU (about the Earth mass spread along the diameter of the SS up to the Kuiper belt). In addition, we review the dynamics of wide binaries inside the dwarf spheroidal galaxies in the Milky Way. The dynamics of such kind of binaries seem to be compatible with the presence of a huge fraction of dark sub-structure, thus their existence is not a sharp discriminant of the dark matter hypothesis as been claimed before. However, there are regimes where the constraints from different astrophysical systems may reveal the sub-structure mass function cut-off scale.