Kavli Affiliate: Risa H. Wechsler
| First 5 Authors: Delon Shen, Nickolas Kokron, Joseph DeRose, Jeremy Tinker, Risa H. Wechsler
| Summary:
Precise and accurate predictions of the halo mass function for cluster mass
scales in $wnu{rm CDM}$ cosmologies are crucial for extracting robust and
unbiased cosmological information from upcoming galaxy cluster surveys. Here,
we present a halo mass function emulator for cluster mass scales ($gtrsim
10^{13}M_odot /h$) up to redshift $z=2$ with comprehensive support for the
parameter space of $wnu{rm CDM}$ cosmologies allowed by current data. Based
on the Aemulus $nu$ suite of simulations, the emulator marks a significant
improvement in the precision of halo mass function predictions by incorporating
both massive neutrinos and non-standard dark energy equation of state models.
This allows for accurate modeling of the cosmology dependence in large-scale
structure and galaxy cluster studies. We show that the emulator, designed using
Gaussian Process Regression, has negligible theoretical uncertainties compared
to dominant sources of error in future cluster abundance studies. Our emulator
is publicly available, providing the community with a crucial tool for upcoming
cosmological surveys such as LSST and Euclid.
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