Imprint of primordial non-Gaussianity on dark matter halo profiles

Azadeh Moradinezhad Dizgah, Scott Dodelson, and Antonio Riotto
Phys. Rev. D 88, 063513 – Published 9 September 2013

Abstract

We study the impact of primordial non-Gaussianity on the density profile of dark matter halos by using the semianalytical model introduced recently by Dalal et al. which relates the peaks of the initial linear density field to the final density profile of dark matter halos. Models with primordial non-Gaussianity typically produce an initial density field that differs from that produced in Gaussian models. We use the path-integral formulation of excursion set theory to calculate the non-Gaussian corrections to the peak profile and derive the statistics of the peaks of the non-Gaussian density field. In the context of the semianalytic model for halo profiles, currently allowed values for primordial non-Gaussianity would increase the shapes of the inner dark matter profiles, but only at the sub-percent level except in the very innermost regions.

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  • Received 16 July 2013

DOI:https://doi.org/10.1103/PhysRevD.88.063513

© 2013 American Physical Society

Authors & Affiliations

Azadeh Moradinezhad Dizgah1,*, Scott Dodelson2,3,4, and Antonio Riotto5

  • 1Department of Physics, University at Buffalo, The State University of New York, Buffalo, New York 14260-1500, USA
  • 2Fermilab Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, USA
  • 3Kavli Institute for Cosmological Physics, Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
  • 4Department of Astronomy and Astrophysics, University of Chicago, Chicago, Illinois 60637, USA
  • 5Department of Theoretical Physics and Center for Astroparticle Physics (CAP), 24 quai E. Ansermet, University of Geneva, CH-1211 Geneva 4, Switzerland

  • *am248@buffalo.edu

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Issue

Vol. 88, Iss. 6 — 15 September 2013

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