%0 Journal Article
%T Prospects for constraining the shape of non-Gaussianity with the scale-dependent bias
%A Norena, J.
%A Verde, L.
%A Barenboim, G.
%A Bosch, C.
%J Journal of Cosmology and Astroparticle Physics
%D 2012
%V 08
%N 8
%I Iop Publishing Ltd
%@ 1475-7516
%G English
%F Norena_etal2012
%O WOS:000308800700020
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=1189), last updated on Thu, 15 Nov 2012 12:25:12 +0000
%X We consider whether the non-Gaussian scale-dependent halo bias can be used not only to constrain the local form of non-Gaussianity but also to distinguish among different shapes. In particular, we ask whether it can constrain the behavior of the primordial three-point function in the squeezed limit where one of the momenta is much smaller than the other two. This is potentially interesting since the observation of a three-point function with a squeezed limit that does not go like the local nor equilateral templates would be a signal of non-trivial dynamics during inflation. To this end we use the quasi-single field inflation model of Chen & Wang [1, 2] as a representative two-parameter model, where one parameter governs the amplitude of non-Gaussianity and the other the shape. We also perform a model-independent analysis by parametrizing the scale-dependent bias as a power-law on large scales, where the power is to be constrained from observations. We find that proposed large-scale structure surveys (with characteristics similar to the dark energy task force stage IV surveys) have the potential to distinguish among the squeezed limit behavior of different bispectrum shapes for a wide range of fiducial model parameters. Thus the halo bias can help discriminate between different models of inflation.
%K redshift surveys
%K cosmological parameters from LSS
%K inflation
%R 10.1088/1475-7516/2012/08/019
%U http://arxiv.org/abs/1204.6324
%U https://doi.org/10.1088/1475-7516/2012/08/019
%P 019-16pp