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Many of the most exciting questions in astrophysics and cosmology, includingthe majority of observational probes of dark energy, rely on an understandingof the nonlinear regime of structure formation. In order to fully exploit theinformation available from this regime and to extract cosmological constraints,accurate theoretical predictions are needed. Currently such predictions canonly be obtained from costly, precision numerical simulations. This paper isthe third in a series aimed at constructing an accurate calibration of thenonlinear mass power spectrum on Mpc scales for a wide range of currentlyviable cosmological models, including dark energy. The first two papersaddressed the numerical challenges, and the scheme by which an interpolator wasbuilt from a carefully chosen set of cosmological models. In this paper weintroduce the "Coyote Univers"' simulation suite which comprises nearly 1,000N-body simulations at different force and mass resolutions, spanning 38 wCDMcosmologies. This large simulation suite enables us to construct a predictionscheme, or emulator, for the nonlinear matter power spectrum accurate at thepercent level out to k~1 h/Mpc. We describe the construction of the emulator,explain the tests performed to ensure its accuracy, and discuss how the centralideas may be extended to a wider range of cosmological models and applications.A power spectrum emulator code is released publicly as part of this paper.

The Coyote Universe III: Simulation Suite and Precision Emulator for the Nonlinear Matter Power Spectrum