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http://hdl.handle.net/2445/127526
Title: | Prospects for constraining the shape of non-Gaussianity with the scale-dependent bias |
Author: | Noreña, Jorge Verde, Licia Barenboim, Gabriela Bosch, Cristian |
Keywords: | Cosmologia Astrofísica Cosmology Astrophysics |
Issue Date: | Aug-2012 |
Publisher: | Institute of Physics (IOP) |
Abstract: | 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. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1088/1475-7516/2012/08/019 |
It is part of: | Journal of Cosmology and Astroparticle Physics, 2012, vol. 2012, num. 019 |
URI: | http://hdl.handle.net/2445/127526 |
Related resource: | https://doi.org/10.1088/1475-7516/2012/08/019 |
ISSN: | 1475-7516 |
Appears in Collections: | Publicacions de projectes de recerca finançats per la UE Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
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