Clipping the Cosmos: The Bias and Bispectrum of Large Scale Structure

Fergus Simpson, J. Berian James, Alan F. Heavens, Catherine Heymans

Research output: Contribution to journalArticlepeer-review

Abstract

A large fraction of the information collected by cosmological surveys is simply discarded to avoid length scales which are difficult to model theoretically. We introduce a new technique which enables the extraction of useful information from the bispectrum of galaxies well beyond the conventional limits of perturbation theory. Our results strongly suggest that this method increases the range of scales where the relation between the bispectrum and power spectrum in tree-level perturbation theory may be applied, from k(max) similar to 0.1 to similar to 0.7 hMpc(-1). This leads to correspondingly large improvements in the determination of galaxy bias. Since the clipped matter power spectrum closely follows the linear power spectrum, there is the potential to use this technique to probe the growth rate of linear perturbations and confront theories of modified gravity with observation.

Original languageEnglish
Article number271301
Pages (from-to)-
Number of pages5
JournalPhysical Review Letters
Volume107
Issue number27
DOIs
Publication statusPublished - 29 Dec 2011

Keywords

  • COSMOLOGICAL POWER SPECTRA
  • NONLINEAR EVOLUTION
  • DENSITY
  • GALAXIES
  • UNIVERSE
  • SIMULATIONS

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