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Juan Carlos Munoz-Cuartas (AIP)

Properties of the distribution of dark matter
Wann Am 10.02.2012 von 10:30 bis 12:00
Was
  • Kolloquium
Wo SH, Hörsaal
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In the standard cosmological paradigm, dark matter contributes with
the second major  fraction of the mass content of the universe. As
such, it has important implications in the dynamics of the universe as
well as in the process of formation of structures and galaxies.
We study the properties of the distribution of dark matter at
different scales: in dark matter halos, around dark matter halos and
in the large scale structure. We study the distribution of mass in
dark matter halos and focus most of our attention on the concentration
parameter. We show how we interpret its mass and redshift dependence
in terms of the growth of the halo. We discuss a novel feature of the
concentration parameter at early times in the formation of halos, who
tend to have higher concentrations than expected. We also study the
distribution of mass around dark matter halos in a broad range of
masses and redshifts. We provide an accurate fitting function for the
full density distribution extending up to ~20 times the virial radius.
In conjunction with the identification of galaxy groups and halos in
the SDSS, this results allow us to build reconstructions of the cosmic
mass density field with interesting features that allow a detailed
study of environments in the large scale structure. We present the
features of this method of reconstruction and discuss some of its
applications.