Slice of MDPL at redshift z = 0.51. More images

The MDPL simulation was performed with the same (1 Gpc/h)3 box size as MDR1, but with more than 6 times higher mass resolution, using nearly 57 billion particles in a cosmology that is consistent with the just recently published Planck data (2013).
It was performed using the L-Gadget2 code.

Some details can be found here: Klypin et al. 2014

Please give proper Credits when using data from this simulation.


Box size 1 Gpc/h side length of the cosmological cube
Number of particles 38403 total number of dark matter particles
Mass resolution 1.51*109 Msun/h mass of one dark matter particle
Force resolution 13 kpc/h (at high z) – 5 kpc/h (low z) physical force resolution
Initial redshift 120 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)


MDPL 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 (halo catalogues, particle tables) contain a Peano-Hilbert key 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 10, i.e. there are 210 = 1024 cells per dimension.

Example queries for each table can be found on the end of the table type description pages.

Database table Table type Short description
MDPL.AvailHalos AvailHalos Gives an overview on the snapshots, for which halo data are stored in the FOF or BDM tables. It additionally gives the number of halos/FOF groups for each snapshot.
MDPL.BDMW BDM BDM catalogue for all available snapshots, calculated using 200*ρcrit (critical density) for defining the halo boundary.
bdmId = snapnum*1011 + NInCat
MDPL.FOF FOF Main Friends-of-Friends catalogue for all available snapshots, level 0. Contrary to the Bolshoi and MDR1 simulation, a relative linking length of 0.20 was used (similar to MDR1.FOFc table).
fofId = (snapnum*10+level)*1011 + NInFile
FOF Friends-of-Friends catalogue for all available snapshots, same as FOF-table, but for smaller (relative) linking lengths (factor 2 for each step), levels 1 (linking length 0.10) to 5 (linking length 0.00625). Thus these tables contain substructures of the FOF groups.
MDPL.LinkLength LinkLength Overview on levels for FOF groups and corresponding linking lengths (for FOF, FOF1 – FOF4 tables)
MDPL.Redshifts Redshifts Overview on snapshot numbers (snapnum) and corresponding redshifts
MDPL.Particles88 Particles Particles’ position and velocity for snapnum=88, z=0


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