• Record: found
  • Abstract: found
  • Article: found
Is Open Access

Constraining higher-order parameters for primordial non-Gaussianities from power spectra and bispectra of imaging survey


Read this article at

      There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.


      We investigate the statistical power of higher-order statistics and cross-correlation statistics to constrain the primordial non-Gaussianity from the imaging surveys. In particular, we consider the local-type primordial non- Gaussianity and discuss how well one can tightly constrain the higher-order non-Gaussian parameters (\(g_{\rm NL}\) and \(\tau_{\rm NL}\)) as well as the leading order parameter \(f_{\rm NL}\) from the halo/galaxy clustering and weak gravitational lensing measurements. Making use of a strong scale-dependent behavior in the galaxy/halo clustering, Fisher matrix analysis reveals that the bispectra can break the degeneracy between non-Gaussian parameters (\(f_{\rm NL}\), \(g_{\rm NL}\) and \(\tau_{\rm NL}\)) and this will give simultaneous constraints on those three parameters. The combination of cross-correlation statistics further improves the constraints by factor of 2. As a result, upcoming imaging surveys like the Large Synoptic Survey Telescope have the potential to improve the constraints on the primordial non-Gaussianity much tighter than those obtained from the CMB measurement by Planck, giving us an opportunity to test the single-sourced consistency relation, \(\tau_{\rm NL} \ge (36/25) f_{\rm NL}^2\).

      Related collections

      Author and article information


      Cosmology & Extragalactic astrophysics


      Comment on this article