The Effects of Primordial Non-Gaussianity on Giant-Arc Statistics: A Scale Dependent Example
Abstract
In a recently published article, we quantified the impact of primordial non-Gaussianity on the probability of giant-arc formation. In that work, we focused on the local form of non-Gaussianity and found that it can have only a modest effect given the most recent constraints from Cosmic Microwave Background (CMB) measurements. Here, we present new calculations using a parameterization of scale-dependent non-Gaussianity in which the primordial bispectrum has the equilateral shape and the effective f_NL parameter depends on scale. We find that non-Gaussianity of this type can yield a larger effect on the giant-arc abundance compared to the local form due to both the scale dependence and the relatively weaker constraints on the equilateral shape from CMB measurements. In contrast to the maximum ~40% effect (within the latest CMB constraints) previously found for the local form, we find that the predicted giant-arc abundance for the scale-dependent equilateral form can differ by a factor of a few with respect to the Gaussian case.
Keywords
Cite
@article{arxiv.1202.0553,
title = {The Effects of Primordial Non-Gaussianity on Giant-Arc Statistics: A Scale Dependent Example},
author = {Anson D'Aloisio and Priyamvada Natarajan},
journal= {arXiv preprint arXiv:1202.0553},
year = {2012}
}
Comments
New results using a scale dependent parameterization of primordial non-Gaussianity, to appear in the proceedings of the 2011 Frank N. Bash New Horizons in Astronomy Symposium