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Non-Gaussian statistics of critical sets in 2D and 3D: Peaks, voids, saddles, genus, and skeleton

Christophe Gay1,2, Christophe Pichon1,3,4, and Dmitry Pogosyan2

  • 1Institut d’astrophysique de Paris, 98, bis boulevard Arago, 75 014, Paris, France
  • 2Department of Physics, University of Alberta, 11322-89 Avenue, Edmonton, Alberta, T6G 2G7, Canada
  • 3Astrophysics, University of Oxford, Keble Road, Oxford OX1 3RH, United Kingdom
  • 4Institut de Physique Théorique, CEA-CNRS, L’orme des meurisiers, 91470, Gif sur Yvette, France

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Phys. Rev. D 85, 023011 – Published 26 January, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.023011

Abstract

The formalism to compute the geometrical and topological one-point statistics of mildly non-Gaussian two-dimensional and three-dimensional (3D) cosmological fields is developed. Leveraging the isotropy of the target statistics, the Gram-Charlier expansion is reformulated with rotation-invariant variables. This formulation allows us to track the geometrical statistics of the cosmic field to all orders. It then allows us to connect the one-point statistics of the critical sets to the growth factor through perturbation theory, which predicts the redshift evolution of higher-order cumulants. In particular, the cosmic nonlinear evolution of the skeleton’s length, together with the statistics of extrema and Euler characteristic are investigated in turn. In two dimensions, the corresponding differential densities are analytic as a function of the excursion set threshold and the shape parameter. In 3D, the Euler characteristics and the field isosurface area are also analytic to all orders in the expansion. Numerical integrations are performed and simple fits are provided whenever closed form expressions are not available. These statistics are compared to estimates from N-body simulations and are shown to match well the cosmic evolution up to root mean square of the density field of ∼0.2. In 3D, gravitational perturbation theory is implemented to predict the cosmic evolution of all the relevant Gram-Charlier coefficients for universes with scale-invariant matter distribution. The one-point statistics of critical sets could be used to constrain primordial non-Gaussianities and the dark energy equation of state on upcoming cosmic surveys; this is illustrated on idealized experiments.

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Phys. Rev. D 85, 023011– Published 26 January, 2012
  • Received 3 October 2011

© 2012 American Physical Society

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