2026-09-21T09:24:04Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/85189 2023-07-11 col_2142_5131 col_2142_14807 com_2142_5130 com_2142_14806 com_2142_8903

Benjamin Wandelt Yadav, Amit P.S. 2015-09-25T22:35:40Z 2015-09-25T22:35:40Z 10000-01-01 2008 2008 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. Made available in DSpace on 2015-09-25T22:35:40Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3337967.pdf: 2397159 bytes, checksum: 72c85cddfde9beebfb01097c3d3ed6a0 (MD5) Previous issue date: 2008 Embargo set by: Seth Robbins for item 86470 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 111 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008. http://hdl.handle.net/2142/85189 (MiAaPQ)AAI3337967 eng Physics, Astronomy and Astrophysics Probing the Cosmological Initial Conditions Using the CMB text Astronomy Astronomy University of Illinois at Urbana-Champaign Dissertation Ph.D.