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Title:Probing the Cosmological Initial Conditions Using the CMB
Author(s):Yadav, Amit P. S.
Doctoral Committee Chair(s):Benjamin Wandelt
Department / Program:Astronomy
Discipline:Astronomy
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Physics, Astronomy and Astrophysics
Abstract:Finally, using our estimator we found (Yadav and Wandelt 2008) evidence for primordial non-Gaussianity of the local type (fNL) in the temperature anisotropy of the Cosmic Microwave Background. Analyzing the bispectrum of the WMAP 3-year data up to lmax=750 we find 27< fNL<147 (95% CL). This amounts to a rejection of fNL=0 at 2.8sigma, disfavoring canonical single field slow-roll inflation. The signal is robust to variations in lmax , frequency, and masks. No known foreground, instrument systematic, or secondary anisotropy explains it. We explore the impact of several analysis choices on the quoted significance and find 2.5sigma to be conservative.
Issue Date:2008
Type:Text
Language:English
Description:111 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008.
URI:http://hdl.handle.net/2142/85189
Other Identifier(s):(MiAaPQ)AAI3337967
Date Available in IDEALS:2015-09-25
Date Deposited:2008


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