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Sophisticated analysis of modern large-scale structure surveys requires mockcatalogs. Mock catalogs are used to optimize survey design, test reduction andanalysis pipelines, make theoretical predictions for basic observables andpropagate errors through complex analysis chains. We present a new method,which we call "quick particle mesh", for generating many large-volume,approximate mock catalogs at low computational cost. The method is based onusing rapid, low-resolution particle mesh simulations that accurately reproducethe large-scale dark matter density field. Particles are sampled from thedensity field based on their local density such that they have N-pointstatistics nearly equivalent to the halos resolved in high-resolutionsimulations, creating a set of mock halos that can be populated using halooccupation methods to create galaxy mocks for a variety of possible targetclasses.

Mock galaxy catalogs using the quick particle mesh method