## BigMDPL

The Big MultiDark Planck simulation belongs to the series of MultiDark simulations with Planck cosmology. It is kin to the MDPL2 simulation, with the same cosmological parameters and particle number, but a larger box size.

Please give proper Credits when using data from this simulation.

### Details

Box size | 2.5 Gpc/h | side length of the cosmological cube |

Number of particles | 3840^{3} |
total number of dark matter particles |

Mass resolution | 2.359*10^{10} M_{sun}/h |
mass of one dark matter particle |

Force resolution | 30 kpc/h (high z) – 10 kpc/h (low-z) | physical force resolution |

Initial redshift | 100 | redshift at which the simulation started |

Cosmology | ||

h | 0.6777 | Hubble parameter |

Ω_{Λ} |
0.692885 | density parameter for dark energy |

Ω_{m} |
0.307115 | density parameter for matter (dark matter+baryons) |

Ω_{b} |
0.048206 | density parameter for baryonic matter |

n | 0.96 | normalization of the Power spectrum |

σ_{8} |
0.8228 | amplitude of mass density fluctuation in 8 Mpc/h sphere (at redshift z=0) |

Other constants | ||

G | 6.67428 * 10^{-8} cm^{3} g^{-1} s^{-2} |
Gravitational constant (Rev. Mod. Phys. 80 (2008) 633-730) |

1 Mpc | 30.85677 * 10^{23} cm |
1 Mpc in cm |

M_{sun} |
1.98892 ± 0.00025 10^{33} g |
Solar mass (Physics Reports 281 (1997) 309) |

### BigMDPL data in the database

The following table provides an overview on the database tables which are available for this simulation. For each table, a link to its “table type” is given, which leads to a page explaining the individual columns of the table in more detail.

Several tables may contain a Peano-Hilbert key (phkey) for each row, which can be constructed from the position using the hilbert key function. If not indicated otherwise, the hilbert order for this simulation is 11, i.e. there are 2^{11} = 2048 cells per dimension.

Database table | Table type | Short description |
---|---|---|

Rockstar | Rockstar | ROCKSTAR halo catalogue, includes halo properties for all available snapshots |

Rockstar_z0 | Rockstar | ROCKSTAR halo catalogue, for z=0 only (snapnum=79) |

Redshifts | Redshifts | Overview on snapshot numbers (snapnum) and corresponding redshifts. In addition to the usual Redshifts-table columns, for SMDPL this table also contains a column `orig_snapnum` , which refers to the original snapshot number of the files. This differs from `snapnum` , because the simulation was run twice, first with more outputs at later times and second with more outputs at early times. |