Simulations

Specifications

This page contains the specification of the simulations in AbacusSummit. We tabulate the simulations below.

Simulation specifications are given a descriptive label, which is included in the simulation name:

  • Base: this is our standard size, 69123 particles in 2 Gpc/h.

  • High: A box with 6x better mass resolution, 63003 in 1 Gpc/h.

  • Highbase: A 1 Gpc/h box with the base mass resolution.

  • Huge: these are larger boxes run with 27x worse mass resolution.

  • Hugebase: Re-runs of some 2 Gpc/h boxes with the same 27x worse mass resolution.

  • Fixedbase: Simulations with the base mass resolution but fixed-amplitude initial conditions, 40963 in 1.18 Gpc/h.

  • Small: Simulations with base mass resolution but 17283 particles in 0.5 Gpc/h.

Run-Time Products

Only a few of our simulations include the full timeslice output; we typically output only subsamples. The “Full Outputs” column in the simulations table below specifies the redshifts (if any) for which a simulation has full timeslices. This column refers to sets of redshifts using the following abbreviations:

  • Full: z = 3.0, 2.5, 2.0, 1.7, 1.4, 1.1, 0.8, 0.5, 0.4, 0.3, 0.2, 0.1

  • Partial: z = 2.5, 1.4, 0.8, 0.2

  • Partial+HiZ: Adds z = 3.0, 2.0 to the Partial list

Subsamples of particles, with positions, velocities, ID numbers, and kernel density estimates, are typically provided at the same 12 redshifts as the Full list (see Data Products). CompaSO group finding is run at these redshifts as well as 21 others (see CompaSO Halo Finder).

Note

The 21 “secondary” redshifts are only approximate and may not match from simulation to simulation. We do not shorten the Abacus timestep to land exactly on these secondary redshifts as we do for the primary redshifts. Always use the redshift in the header, not the directory name.

The huge and hugebase sims have fewer group finding and subsample epochs.

Base sims and Huge sims have light-cone outputs; others do not.

A base simulation typically produces about 10 TB of subsampled output, and each output slice is another 4 TB above that.

Covariance (Small) Boxes

We ran 2000 small simulations in 500 Mpc/h at the base mass resolution, intended for studies of covariance matrices in periodic boundary conditions. These have particle subsample outputs at z = 1.4, 1.1, 0.8, 0.5, and 0.2, as well as halo finding at all redshifts >0.2. However, about 15% of these simulations crashed due to some unresolved issue, almost certainly uncorrelated with any property of the large-scale structure in the simulation. Some of the crashed ones still produced usable outputs at higher redshifts. We have chosen to present the 1883 that yielded outputs at z = 1.1; 1643 of these reached z = 0.2. The numbering between ph3000 and ph4999 will be irregular.

Simulations Table

Download the simulations table here.

The cosmologies in the “Cosm” column are tabulated in Cosmologies.

The “PPD” column is the number of particles-per-dimension.

Note

The following table is wide, you may have to scroll to the right to see all the columns.

SimName

Cosm

Phase

PPD

Box (Mpc/h)

z_Final

Full Outputs

Notes

AbacusSummit_base_c000_ph000

000

000

6912

2000

0.1

Full

Planck2018 LCDM

AbacusSummit_base_c000_ph{001-005}

000

001-005

6912

2000

0.1

Partial+HiZ

Planck2018 LCDM

AbacusSummit_base_c000_ph{006-024}

000

006-024

6912

2000

0.1

none

Planck2018 LCDM

AbacusSummit_high_c000_ph100

000

100

6300

1000

0.1

Full

High-res LCDM, no lightcone

AbacusSummit_highbase_c000_ph100

000

100

3456

1000

0.1

Full

Base-res LCDM, no lightcone

AbacusSummit_huge_c000_ph201

000

201

8640

7500

0.1

1.4, 1.1, 0.8, 0.5, 0.2

Low-res LCDM, box-centered lightcone

AbacusSummit_huge_c000_ph202

000

202

8640

7500

0.1

1.4, 1.1, 0.8, 0.5, 0.2

Low-res LCDM, box-centered lightcone

AbacusSummit_hugebase_c000_ph{000-024}

000

000-024

2304

2000

0.1

1.4, 1.1, 0.8, 0.5, 0.2

Low-res match to base, no lightcone

AbacusSummit_fixedbase_c000_ph099

000

099

4096

1185

0.1

Full

Base-res LCDM, fixed amplitudes

AbacusSummit_fixedbase_c000_ph098

000

098

4096

1185

0.1

Full

Base-res LCDM, fixed amplitudes, inversion of phase 99

AbacusSummit_small_c000_ph{3000-4999}

000

3000-4999

1728

500

0.2

none

Covariance matrix set

AbacusSummit_base_c001_ph000

001

000

6912

2000

0.1

Partial+HiZ

Low omega_c

AbacusSummit_base_c001_ph{001-005}

001

001-005

6912

2000

0.1

Partial

Low omega_c

AbacusSummit_base_c002_ph000

002

000

6912

2000

0.1

Partial+HiZ

wCDM with thawing model w0 = -0.7, wa = -0.5

AbacusSummit_base_c002_ph{001-005}

002

001-005

6912

2000

0.1

Partial

wCDM with thawing model w0 = -0.7, wa = -0.5

AbacusSummit_base_c003_ph000

003

000

6912

2000

0.1

Partial+HiZ

Neff=3.70, from base_nnu_plikHM_TT_lowl_lowE_Riess18_post_BAO

AbacusSummit_base_c003_ph{001-005}

003

001-005

6912

2000

0.1

Partial

Neff=3.70, from base_nnu_plikHM_TT_lowl_lowE_Riess18_post_BAO

AbacusSummit_base_c004_ph000

004

000

6912

2000

0.1

Partial+HiZ

Low sigma8_matter = 0.75, otherwise Baseline LCDM

AbacusSummit_base_c004_ph{001-005}

004

001-005

6912

2000

0.1

Partial

Low sigma8_matter = 0.75, otherwise Baseline LCDM

AbacusSummit_fixedbase_c{001-004}_ph099

001-005

099

4096

1185

0.1

Partial

Base-res LCDM, fixed amplitudes

AbacusSummit_base_c009_ph000

009

000

6912

2000

0.1

Partial

Baseline LCDM with massless neutrinos

AbacusSummit_base_c010_ph000

010

000

6912

2000

0.1

none

AbacusCosmos LCDM

AbacusSummit_base_c012_ph000

012

000

6912

2000

0.1

none

Euclid Flagship1

AbacusSummit_base_c013_ph000

013

000

6912

2000

0.1

none

Euclid Flagship2

AbacusSummit_base_c014_ph000

014

000

6912

2000

0.1

none

OuterRim

AbacusSummit_base_c015_ph000

015

000

6912

2000

0.1

none

Dark Sky

AbacusSummit_base_c016_ph000

016

000

6912

2000

0.1

none

Horizon

AbacusSummit_base_c017_ph000

017

000

6912

2000

0.1

none

Illustris

AbacusSummit_base_c018_ph000

018

000

6912

2000

0.1

none

Multidark Planck

AbacusSummit_base_c019_ph000

019

000

6912

2000

0.1

none

Baseline LCDM w/2 massive neutrino species

AbacusSummit_base_c020_ph000

020

000

6912

2000

0.1

none

Baseline LCDM with massless neutrinos

AbacusSummit_highbase_c021_ph000

021

000

3456

1000

0.1

Partial

MassiveNUs with massless neutrinos

AbacusSummit_highbase_c022_ph000

022

000

3456

1000

0.1

Partial

MassiveNUs w/1 massive 0.1 eV neutrino species

AbacusSummit_base_c{100-115}_ph000

100-115

000

6912

2000

0.1

none

Linear Derivative Grid

AbacusSummit_base_c116_ph000

116

000

6912

2000

0.1

none

Linear Derivative Grid

AbacusSummit_base_c{117-126}_ph000

117-126

000

6912

2000

0.1

none

Linear Derivative Grid

AbacusSummit_base_c{130-181}_ph000

130-181

000

6912

2000

0.1

none

Broader Emulator Grid

Missing Data

In the course of running AbacusSummit, a few rare instances of irreversible data loss occurred before the data could be archived. The resulting inhomogeneities in the data products presented by AbacusSummit are recorded here.

  • AbacusSummit_base_c103_ph000, for redshifts 0.8 and above, is missing all field particles and all halo RVs (but not halo PIDs). Consequently, the halo cleaning is not present at redshift 0.8 and above.

  • AbacusSummit_base_c004_ph003 is missing full (pack9) time slice outputs for redshifts 0.8 and 1.4. And, as a result, no time slice power spectra exist for those redshifts (AB power spectra exist as normal).