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News
  • Les premiers zoom de galaxies sont accessibles
  • Le halo FOF 6133 de la boite Horizon L et le halo FOF 544 de Horizon S ont été resimulés avec plusieurs techniques de zoom. Il est important que chaque "zoomer" valide sa méthode, avant de lancer une campagne de zoom sur un plus grand cataloque.
  • Les données de la simulation Mare Nostrum sont disponibles
  • 34 snapshots jusqu’à z=4 sont accessibles sur horizon3 et sur le serveur de fichiers de l’IDRIS à la collaboration Horizon.
  • Méso Machine HPC1 opérationnelle
  • Depuis le 23 Octobre 2005, la Méso machine du site horizon est operationnelle. Elle correspond à 3 quadriprocesseurs avec chacun 64 Giga de RAM reliés par infiniband, ainsi qu’un access conséquent (sur une base de projet dédié) au reste de la ferme). Son acces est ouvert a toute personne de la collaboration ayant acces à la minigrille et qui en fait la demande a admin-minigrille
  • http://
  • Workshop Horizon le 14 et 15 novembre 2005
  • Il aura lieu à Paris les 14 et 15 novembre 2005 (prévoir une nuit sur place). L’enregistrement est ouvert dans la rubrique "meeting!"
  • http://

General Informations


by Aubert Dominique (Tuesday 23 May 2006)

The current section contains all the information about the Horizon’s Cosmological Initial Conditions.

These ICs consist in 3 boxes with different sizes in order to cover the large range of scales involved in cosmology. All these boxes have been generated through the same production pipeline and in particular, they were produced from the same set of phases (or white noise). As a consequence, the different volumes share the same overall distribution of matter, even tough they differ in the details because of the scale dependence of the clustering and the physics.

Parameters & Cosmology


The transfer function follows the prescription given by Eisenstein & Hu . The cosmological parameters are the same for the 3 boxes and are summarized in the following table.

Parametervalue
omega_m0.3
omega_v0.7
omega_b0.04
n1
h0 (km s-1 Mpc-1)70
Q-rms19.89

This prescription P(k) takes in account baryonic features such as wiggles and small scale damping.

Format and Structure


These files were generated with MP_GRAFIC and their structure follows the format used by GRAFIC. Additionnal information, on the software, the conversion or the file format can be found here, here and here.

The Other sections


  • The Production Pipeline section describes the procedure implemented by the collaboration to produce this set of ICs.
  • The Full Box ICs section contains low resolution versions of the 3 set of ICs, which are available by direct download. The different locations of the full resolution ICs are also specified in this section.
  • The Initial Phases section contain the phases which have been used to generate the ICs. The full resolution file and its degraded versions are available via direct download.