AbacusSummit
============
What is AbacusSummit?
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AbacusSummit is a suite of large, high-accuracy cosmological N-body simulations.
These simulations were designed to meet (and exceed!) the Cosmological Simulation Requirements of
the `Dark Energy Spectroscopic Instrument (DESI) survey `_. AbacusSummit
was run on the `Summit `_ supercomputer at the Oak Ridge Leadership
Computing Facility under a time allocation from the Department of Energy's ALCC program.
Most of the simulations in AbacusSummit are 6912\ :sup:`3` = 330 billion
particles in 2 Gpc/*h* volume, yielding a particle mass of about :math:`2\times 10^9\ \mathrm{M}_\odot/h`.
AbacusSummit consists of over 140 of these simulations, plus other larger and smaller simulations,
totaling about 60 trillion
particles. Detailed specifications of the :doc:`simulations` and :doc:`cosmologies`
are available on other pages.
Key portions of the suite are:
* A primary Planck2018 LCDM cosmology with 25 base simulations (330 billion particles in 2 Gpc/*h*).
* Four secondary cosmologies with 6 base simulations, phase matched to the first 6 of the primary boxes.
* A grid of 79 other cosmologies, each with 1 phase-matched base simulation, to support interpolation in an 8-dimensional parameter space, including :math:`w_0`, :math:`w_a`, :math:`N_\mathrm{eff}`, and running of the spectral index.
* A suite of 1800 small boxes at the base mass resolution to support covariance estimation
* Other base simulations to match the cosmology of external flagship simulations and to explore the effects of our neutrino approximation.
* A 6x higher mass resolution simulation of the primary cosmology to allow study of group finding, and a large-volume 27x lower mass resolution simulation of the primary cosmology to provide full-sky light cone to *z*>2.
* Specialty simulations including those with fixed-amplitude white noise and scale-free simulations.
* Extensive data products including particle subsamples, halo catalogs, merger trees, kernel density estimates, and light cones.