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- W1890585118 abstract "The halo occupation distribution (HOD) approach has proven to be an effective method for modeling galaxy clustering and bias. In this approach, galaxies of a given type are probabilistically assigned to individual halos in N-body simulations. In this paper, we present a fast emulator for predicting the fully nonlinear galaxy power spectrum over a range of freely specifiable HOD modeling parameters. The emulator is constructed using results from 100 HOD models run on a large LCDM N-body simulation, with Gaussian Process interpolation applied to a PCA-based representation of the galaxy power spectrum. The total error is currently ~3% (~2% in the simulation and ~1% in the emulation process) from z=1 to z=0, over the considered parameter range. We use the emulator to investigate parametric dependencies in the HOD model, as well as the behavior of galaxy bias as a function of HOD parameters. The emulator is publicly available at http://www.hep.anl.gov/cosmology/CosmicEmu/emu.html." @default.
- W1890585118 created "2016-06-24" @default.
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- W1890585118 date "2015-08-27" @default.
- W1890585118 modified "2023-10-17" @default.
- W1890585118 title "COSMIC EMULATION: FAST PREDICTIONS FOR THE GALAXY POWER SPECTRUM" @default.
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- W1890585118 doi "https://doi.org/10.1088/0004-637x/810/1/35" @default.
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