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(1) Presentation(s)


Lun. 05/02/2018 13:30 Grande Ourse, Bâtiment 13, Etage 1

PENARRUBIA Jorge (Institute for Astronomy - Edinburgh Univ.)
Finding the invisible - the search for dark substructures

(LUPM/Interactions fondamentales, Astroparticules et Cosmologie)


One of the most striking predictions from the Cold Dark Matter (CDM) paradigm postulates the existence of myriads of planet-sized subhaloes devoid of stars (i.e. `dark'). A large population of these objects generates a stochastic gravitational field that can perturb the trajectories of visible systems. In this talk I will present a statistical technique for deriving the spectrum of random fluctuations directly from the number density of substructures with known mass and size functions.
I will show that in galaxies like the Milky Way the fluctuations of the tidal field are completely dominated by the smallest and most abundant subhaloes. In light of this result I will discuss observational experiments that may be sufficiently sensitive to Galactic tidal fluctuations to probe the ``dark'' low-end of the subhalo mass function and constrain the particle mass of warm and ultra-light axion dark matter models.

Pour plus d'informations, merci de contacter Lavalle J.