A slice of the BigMDPL simulation at z=0.

A slice of the BigMDPL simulation at z=0.

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.


Box size 2.5 Gpc/h side length of the cosmological cube
Number of particles 38403 total number of dark matter particles
Mass resolution 2.359*1010 Msun/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
h 0.6777 Hubble parameter
ΩΛ 0.692885 density parameter for dark energy
Ωm 0.307115 density parameter for matter (dark matter+baryons)
Ωb 0.048206 density parameter for baryonic matter
n 0.96 normalization of the Power spectrum
σ8 0.8228 amplitude of mass density fluctuation in 8 Mpc/h sphere (at redshift z=0)
Other constants
G 6.67428 * 10-8 cm3 g-1 s-2 Gravitational constant (Rev. Mod. Phys. 80 (2008) 633-730)
1 Mpc 30.85677 * 1023 cm 1 Mpc in cm
Msun 1.98892 ± 0.00025 1033 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 211 = 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.


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