The Coyote Universe Extended: Precision Emulation of the Matter Power Spectrum
Katrin Heitmann, Earl Lawrence, Juliana Kwan, Salman Habib, and David, Higdon

TL;DR
This paper presents an improved and extended matter power spectrum emulator that covers a broader range of scales, redshifts, and cosmological parameters with high accuracy, enabling better theoretical predictions for cosmological observations.
Contribution
The authors develop an extended emulator for the matter power spectrum that significantly increases the range in k, z, and cosmological parameters while maintaining ~5% accuracy, using a cost-effective multi-scale simulation strategy.
Findings
Extended the emulator to k~10 h/Mpc and z=4.
Included the Hubble parameter as a variable.
Achieved ~5% error control at domain edges.
Abstract
Modern sky surveys are returning precision measurements of cosmological statistics such as weak lensing shear correlations, the distribution of galaxies, and cluster abundance. To fully exploit these observations, theorists must provide predictions that are at least as accurate as the measurements, as well as robust estimates of systematic errors that are inherent to the modeling process. In the nonlinear regime of structure formation, this challenge can only be overcome by developing a large-scale, multi-physics simulation capability covering a range of cosmological models and astrophysical processes. As a first step to achieving this goal, we have recently developed a prediction scheme for the matter power spectrum (a so-called emulator), accurate at the 1% level out to k~1/Mpc and z=1 for wCDM cosmologies based on a set of high-accuracy N-body simulations. It is highly desirable to…
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