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General description

The simulations in the DREAMS project are designed to 1) unveil the nature of dark matter and 2) improve our knowledge on the physics shaping the Universe on small scales.

Organization

DREAMS contains thousands of N-body and hydrodynamic simulations. The simulations can be organized into:

The scheme below illustrates the DREAMS data structure. The ellipses represent the different models, and the relation among them. For instance, CDM, WDM, and h-peak k-peak models are a subset of ETHOS. Inside each ellipse, we show the available types. For instance, the CDM model contains cosmological boxes, Milky way zoom-ins, and dwarfs zoom-ins. The color of the types indicates the suite: purple (run with IllustrisTNG), yellow (run with Ramses).

DREAMS data structure

Characteristics

This table shows the characteristics of the DREAMS simulations:

Model Type Suite Cosmology Simulations Status
Cold dark matter (CDM) Boxes IllustrisTNG Varied 1024 Complete
Milky Way IllustrisTNG Varied 1024 Running
Dwarfs Ramses Varied 1024 Planned
           
Warm dark matter (WDM) Boxes N-body Fixed 600 Complete
Boxes N-body Varied 1000 Complete
Boxes IllustrisTNG Varied 1024 Complete
Milky Way IllustrisTNG Fixed 1024 Complete
           
Hpeak Kpeak Boxes N-body Fixed 400 Complete
Boxes N-body Varied 1024 Planned
Boxes IllustrisTNG Varied 1024 Planned
Dwarfs Ramses Varied 1024 Planned
           
ETHOS Milky way N-body Varied 1024 Planned
Milky Way IllustrisTNG Varied 1024 Planned
           
Atomic dark matter (ADM) Milky way N-body Varied 1024 Planned
Milky Way IllustrisTNG Varied 1024 Planned

Redshifts

All simulations contain 91 snapshots. This file contains the scale factors of the snapshots. The user can click below to see the redshift, scale factor, and snapshot number for the different snapshots:

Click here to see the relation between the snapshot number and the redshift
Redshift Scale Factor snapshot number
14.99 0.063 000
13.34 0.070 001
11.98 0.077 002
11.20 0.082 003
10.48 0.087 004
9.69 0.094 005
9.00 0.100 006
8.49 0.105 007
8.01 0.111 008
7.60 0.116 009
7.24 0.121 010
6.89 0.127 011
6.56 0.132 012
6.28 0.137 013
6.01 0.143 014
5.75 0.148 015
5.50 0.154 016
5.23 0.161 017
5.00 0.167 018
4.80 0.172 019
4.61 0.178 020
4.45 0.183 021
4.30 0.189 022
4.15 0.194 023
4.01 0.200 024
3.87 0.205 025
3.73 0.211 026
3.62 0.216 027
3.49 0.223 028
3.36 0.229 029
3.24 0.236 030
3.12 0.242 031
3.01 0.249 032
2.90 0.257 033
2.80 0.263 034
2.72 0.269 035
2.63 0.276 036
2.54 0.282 037
2.46 0.289 038
2.38 0.296 039
2.30 0.303 040
2.22 0.310 041
2.15 0.318 042
2.07 0.325 043
2.00 0.333 044
1.93 0.341 045
1.86 0.349 046
1.80 0.358 047
1.73 0.366 048
1.67 0.375 049
1.60 0.384 050
1.54 0.393 051
1.48 0.403 052
1.43 0.412 053
1.37 0.422 054
1.30 0.434 055
1.26 0.443 056
1.20 0.455 057
1.14 0.466 058
1.09 0.478 059
1.05 0.489 060
1.00 0.501 061
0.95 0.513 062
0.90 0.525 063
0.86 0.538 064
0.82 0.550 065
0.77 0.564 066
0.73 0.577 067
0.69 0.591 068
0.65 0.605 069
0.61 0.620 070
0.58 0.635 071
0.54 0.650 072
0.50 0.665 073
0.47 0.681 074
0.43 0.698 075
0.40 0.714 076
0.37 0.731 077
0.34 0.749 078
0.30 0.771 079
0.27 0.789 080
0.24 0.808 081
0.21 0.827 082
0.18 0.847 083
0.15 0.867 084
0.13 0.888 085
0.10 0.910 086
0.07 0.931 087
0.05 0.954 088
0.02 0.977 089
0.00 1.000 090

Note

The exact redshifts of a given snapshot may be slighty different to the above ones. For instance, there are small differences between the exact redshifts of the snapshots in the Astrid and SIMBA suites. In the simulations of the IllustrisTNG suite these numbers can also be slightly different, since AREPO can only write snapshots in the highest time steps in the hierarchy.

Warning

Due to space constraints, we have moved some snapshots to tape. If you need these please reach out.