Speaker
Dr
Jens Stücker
(Max-Planck-Institut für Astrophysik, Garching)
Description
Dark matter, as a cold collisionless fuid, effectively occupies a three-dimensional sub-manifold in six-dimensional phase space. In simulations, this "dark matter sheet" can in principle be reconstructed by interpolation techniques to obtain an almost exact density estimate. However, in regions of strong mixing (like dark matter haloes), this is difficult due to the rapid growth of the sheet's complexity and an alternative is required. I will present a hybrid scheme which uses sheet-interpolation-techniques where a reconstruction is possible, and N-body-techniques in regions of strong mixing. This makes possible warm dark matter simulations that are reliable inside low- and high-density regions for the first time.
