1. Physics Colloquium

    "Dark Matter in Galaxies and Supermassive Black Holes"

    Presented by Hector De Vega, LPTHE/CNRS-Univ P & M Curie

    Tuesday, March 12, 2013, 3:30 pm
    Large Seminar Room, Bldg. 510

    Hosted by: Robert Pisarski

    81 % of the matter of the universe is dark matter (DM). DM is the dominant component of galaxies. Warm dark matter (WDM, DM particles with mass in the keV scale) is able to naturally solve the serious drawbacks of cold dark matter (CDM) at small and galactic scales, keeping all its brilliant successes at large and cosmological scales. WDM produces the correct abundance of substructures at zero and higher redshifts. Quantum mechanics turns to play a crucial role in small scale WDM galaxy structure (kpc scales and below). Compact dwarf galaxies turn to be natural quantum macroscopic objects, supported against gravity by the fermionic WDM quantum pressure, while larger galaxies appear naturally in the dilute and classical regime as we show adapting the Thomas-Fermi semiclassical approach of atomic physics. Supermassive black-hole masses are consistent with WDM. The possible detection (both astronomical and in the laboratory) of keV mass sterile neutrinos will be reviewed.