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Title: On estimating cosmology-dependent covariance matrices

We describe a statistical model to estimate the covariance matrix of matter tracer two-point correlation functions with cosmological simulations. Assuming a fixed number of cosmological simulation runs, we describe how to build a 'statistical emulator' of the two-point function covariance over a specified range of input cosmological parameters. Because the simulation runs with different cosmological models help to constrain the form of the covariance, we predict that the cosmology-dependent covariance may be estimated with a comparable number of simulations as would be needed to estimate the covariance for fixed cosmology. Our framework is a necessary first step in planning a simulations campaign for analyzing the next generation of cosmological surveys.
Authors:
 [1] ;  [2]
  1. University of California, Davis, One Shields Ave., Davis, CA, 95616 (United States)
  2. Lawrence Livermore National Laboratory, P.O. Box 808 L-210, Livermore, CA 94551-0808 (United States)
Publication Date:
OSTI Identifier:
22369947
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CORRELATION FUNCTIONS; COSMOLOGICAL MODELS; COSMOLOGY; MATRICES; SIMULATION; STATISTICAL MODELS