Thursday, July 11, 2013

1307.2632 (Azadeh Moradinezhad Dizgah et al.)

Imprint of Primordial non-Gaussianity on Dark Matter Halo Profiles    [PDF]

Azadeh Moradinezhad Dizgah, Scott Dodelson, Antonio Riotto
We study the impact of primordial non-Gaussianity on the density profile of dark matter halos by using the semi-analytical model introduced recently by Dalal {\it 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 non-Gaussian density field. In the context of the semi-analytic 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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