{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/85189"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/85189","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Probing the Cosmological Initial Conditions Using the CMB","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.","abstract_html":"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&lt; fNL&lt;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.","abstract_has_math":false,"creators":["Yadav, Amit P.S."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Astronomy","degree_department":null,"school":null,"contributors":["Benjamin Wandelt"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T22:35:40Z","date_published":"2015-09-25T22:35:40Z","updated_at":"2026-07-22T22:26:24Z","subjects":["Physics, Astronomy and Astrophysics"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3337967"],"render_values":[{"text":"(MiAaPQ)AAI3337967","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/85189","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Benjamin Wandelt"]},{"key":"dc:creator","label":"Author","values":["Yadav, Amit P.S."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T22:35:40Z","10000-01-01","2008"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Astronomy"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Astronomy and Astrophysics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/85189","(MiAaPQ)AAI3337967"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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). 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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). 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