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Project Acronym HORIZON
Scientific Discipline Astrophysics, cosmology
Principal Investigator(s) Julien Devriendt
Leading Institution Centre de Recherche Astronomique de Lyon, France
Partner Institution(s)
  • CNRS - CEA


The Horizon Project is led by a french consortium whose objective is to tackle the key astrophysical issue of galaxy formation in the explicit cosmological context of an expanding universe dominated by dark matter and dark energy. To achieve this goal, we plan to run the largest and most resolved N-body and hydrodynamic simulation to date with state-of-the-art subgrid physics modelling to describe star formation and feedback processes. For this purpose, we use an Adaptive Mesh Refinement (AMR) code called RAMSES (R. Teyssier, A&A, 2002, 385, 337), which is a tree-based, high-order Godunov solver with self gravity. Its parallelization strategy relies on an MPI-based adaptive domain decomposition, using a "space-filling Peano-Hilbert curve". To be more specific, DECI provides us with the first opportunity to perform a 20 billion grid cell simulation, allowing us for the first time to resolve the formation of "dwarf galaxies" within a large enough volume fraction of the Universe to beat the cosmic variance. Our requirements for this extreme run is around 8 Terabyte of RAM memory and 4096 processors.

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