Science

Last Updated: 22nd Feb., 2017.

Papers

Cosmological Parameters

Planck 2013 Cosmology

\(\Omega_{\Lambda}\) \(\Omega_{m}\) \(\sigma_{8}\) \(n_{s}\) \(h\)
0.68 0.31 0.83 0.96 0.67

Simulation Parameters

Parent Simulation

Volume
h3 Mpc3
# particles \(m_{dm}\)
107 h-1 \(M_\odot\)
\(m_{dm}\)
107 \(M_\odot\)
\(\epsilon_{dm}\)
pc
1003 10243 9 12 2441

Caterpillar (zoom-in) Simulations

~Aquarius
Level
MUSIC
levelmax
Effective
Resolution
\(m_{dm}\)
104 h-1 \(M_\odot\)
\(m_{dm}\)
104 \(M_\odot\)
\(\epsilon_{dm}\)
pc
1 15 327683 0.25 0.37 36
2 14 163843 2 3 76
3 13 80963 16 24 152
4 12 40963 128 190 228
5 11 20483 1025 1527 452

Notes: LX15 has only been run down to z = 6 for some of the halos. The rest are run down to z = 0. Timesteps are logarithm in expansion factor down to z = 6 (10 Myrs/snapshot) and linear in expansion factor down to z = 0 (50 Myrs/snapshot) for all runs. We have complete (modified) rockstar halo catalogues (together with consistent-trees merger trees) and z = 0 subfind catalogues.

Initial Conditions

Although we adopt a modified version of MUSIC (v1.51), we include here for completeness our parameter file for our parent simulation from which all Caterpillar halos were extracted.

[setup]  
boxlength               = 100  
zstart                  = 127  
levelmin                = 10  
levelmin_TF             = 10  
levelmax                = 10  
padding                 = 8  
overlap                 = 4  
ref_center              = 0.5, 0.5, 0.5  
ref_extent              = 0.2, 0.2, 0.2  
align_top               = yes  
baryons                 = no  
use_2LPT                = no  
use_LLA                 = no  
periodic_TF             = yes  

[cosmology]  
Omega_m                 = 0.3175          
Omega_L                 = 0.6825          
Omega_b                 = 0.0489991       
H0                      = 67.11           
sigma_8                 = 0.8344         
nspec                   = 0.9624          
transfer                = eisenstein  

[random]  
seed[10]                = 34567  

[output]  
format                  = gadget2  
filename                = ./ics  
gadget_num_files        = 128  

[poisson]  
fft_fine                = yes  
accuracy                = 1e-5  
pre_smooth              = 3  
post_smooth             = 3  
smoother                = gs  
laplace_order           = 6  
grad_order              = 6 

Our P-Gadget3/Gadget4 flags used in our configuration file are as follows:

PERIODIC  
UNEQUALSOFTENINGS  
PMGRID=512  
GRIDBOOST=2  
PLACEHIGHRESREGION=2  
ENLARGEREGION=1.2  
MULTIPLEDOMAINS=16  
PEANOHILBERT  
WALLCLOCK  
MYSORT  
DOUBLEPRECISION  
OUTPUT_IN_DOUBLEPRECISION  
INPUT_IN_DOUBLEPRECISION  
ORDER_SNAPSHOTS_BY_ID  
NO_ISEND_IRECV_IN_DOMAIN  
FIX_PATHSCALE_MPI_STATUS_IGNORE_BUG  
COMPUTE_POTENTIAL_ENERGY  
OUTPUTPOTENTIAL  
RECOMPUTE_POTENTIAL_ON_OUTPUT  
HAVE_HDF5  
DEBUG