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OATS-UNI/TS SEMINAR
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Speaker: Volker Springel (Heidelberg Inst. for Theoretical Studies)
Title: Cosmology on a moving mesh
Date: Wednesday, November 14th, 2012
Time: 11:30
Venue: Villa Bazzoni
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Abstract: I review some recent results of cosmological simulations of galaxy
formation, with a focus on hydrodynamical simulations and ultra-large
N-body simulations. In particular, I discuss how simulations using the
new moving-mesh code AREPO compare with calculations based on the
traditional SPH technique. Our results demonstrate that inaccuracies
in hydrodynamic solvers can lead to comparatively large systematic
differences even at the level of predictions for the global state of
baryons in the universe. Results based on AREPO show systematically
higher star formation rates at late times, lower mean temperatures
averaged over the simulation volume, and larger galactic disks. There
are also important improvements in the representation of subsonic
turbulence in the gaseous atmospheres of halos. I will also discuss
some results from the Millennium-XXL simulation, the largest
high-resolution cosmological N-body simulation carried out to date.
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Contact: Stefano Borgani (OATS)