Kavli Affiliate: Katrin Heitmann
| First 5 Authors: Gillian D. Beltz-Mohrmann, Adrian Pope, Alex Alarcon, Michael Buehlmann, Nicholas Frontiere
| Summary:
In this paper, we present the Discovery simulations: a new pair of
high-resolution N-body simulations motivated by the DESI Y1 BAO cosmological
constraints on dark energy. The Discovery simulations were run with identical
initial conditions, and differ only in their cosmological parameters. The first
simulation is based on a flat $Lambdamathrm{CDM}$ cosmology, while the second
is based on a $w_0 w_amathrm{CDM}$ cosmology, with particular parameter values
chosen based on the DESI analysis which includes constraints from BAO with CMB
priors. Both simulations evolve $6720^3$ particles in a box with a side length
of $L_mathrm{box} = 1.5$ Gpc, leading to a mass resolution of $sim4 times
10^8$ $mathrm{M}_{odot}$ in each simulation. In this work we demonstrate the
impact of the $w_0 w_amathrm{CDM}$ cosmology on the matter power spectrum,
halo mass function, and halo mass accretion rate. We also populate halos with
galaxies using a novel forward model for in-situ star formation, and examine
the way in which changes to cosmology manifest as changes in star formation
history. The Discovery simulations provide a testbed for alternative
cosmological probes that may offer additional constraining power beyond BAO,
such as higher-order summary statistics and observables in the nonlinear
regime. Halo catalogs from the Discovery simulations are publicly available and
can be downloaded from the HACC Simulation Data Portal.
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