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Probing higher-order primordial non-Gaussianity with galaxy surveys

Daisuke Yamauchi1,2,* and Keitaro Takahashi3

  • 1Research Center for the Early Universe, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 2Faculty of Engineering, Kanagawa University, Kanagawa-ku, Yokohama-shi, Kanagawa 221-8686, Japan
  • 3Faculty of Science, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan

  • *yamauchi@resceu.s.u-tokyo.ac.jp
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Phys. Rev. D 93, 123506 – Published 6 June, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.123506

Abstract

With a radio continuum galaxy survey by the Square Kilometre Array (SKA), a photometric galaxy survey by Euclid, and their combination, we forecast future constraints on primordial non-Gaussianity. We focus on the potential impact of local-type higher-order nonlinear parameters on the parameter estimation and particularly the confirmation of the inflationary consistency inequality. Nonstandard inflationary models, such as multifield models, introduce the scale-dependent stochastic clustering of galaxies on large scales, which is a unique probe of mechanism for generating primordial density fluctuations. Our Fisher matrix analysis indicates that a deep and wide survey provided by SKA is more advantageous to constrain τNL, while Euclid has a strong constraining power for fNL due to the redshift information, suggesting that the joint analysis between them is quite essential to break the degeneracy between the nonlinear parameters. The combination of the full SKA and Euclid will achieve the precision level needed to confirm the consistency inequality even for fNL≈1.5 and τNL≈17, though it is still hard for a single survey to confirm it when fNL≲2.7.

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Phys. Rev. D 93, 123506– Published 6 June, 2016
  • Received 6 October 2015

© 2016 American Physical Society

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