Return to search

Probing primordial non-Gaussianity using large scale structure

Includes abstract. / Includes bbliographical references (leaves 65-69). / Recent evidence from the WMAP satellite has lead to a tentative detection of non-Gaussianity. Using the bispectrum statistic applied to the MegaZ catalogue of over 600,000 luminous red galaxies we find new bounds on the large-scale nonGaussianity. We constrain the fNL parameter using a particular type of triangular configuration as well as the combination of all the possible triangles in harmonic space. The constraint on fNL from the combination of all possible triangular configurations is ffV'ial = 57 ± 52 with 68% confidence limit, which is consistent with vanishing primordial non-Gaussianity, although some triangular configurations on their own suggest a non-zero bispectrum which, if confirmed, would have a profound effect on modern cosmology.
Date January 2009
CreatorsFantaye, Yabebal
ContributorsBassett, Bruce, Blake, Chris
PublisherUniversity of Cape Town, Faculty of Science, Department of Astronomy
Source SetsSouth African National ETD Portal
Detected LanguageEnglish
TypeMaster Thesis, Masters, MSc

Page generated in 0.0135 seconds