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http://hdl.handle.net/2445/131761
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DC Field | Value | Language |
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dc.contributor.author | Mangilli, Anna | - |
dc.contributor.author | Verde, Licia | - |
dc.date.accessioned | 2019-04-08T11:02:21Z | - |
dc.date.available | 2019-04-08T11:02:21Z | - |
dc.date.issued | 2009-12-08 | - |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/2445/131761 | - |
dc.description.abstract | We revisit the predictions for the expected cosmic microwave background bispectrum signal from the cross-correlation of the primary-lensing-Rees-Sciama signal; we point out that it can be a significant contaminant to the bispectrum signal from primordial non-Gaussianity of the local type. This non-Gaussianity, usually parametrized by the non-Gaussian parameter f N L , arises, for example, in multifield inflation. In particular both signals are frequency-independent, and are maximized for nearly squeezed configurations. While their detailed scale-dependence and harmonic imprints are different for generic bispectrum shapes, we show that, if not included in the modeling, the primary-lensing-Rees-Sciama contribution yields an effective f N L of 10 when using a bispectrum estimator optimized for local non-Gaussianity. Considering that expected 1 − σ errors on f N L are < 10 from forthcoming experiments, we conclude that the contribution from this signal must be included in future constraints on f N L from the cosmic microwave background bispectrum. | - |
dc.format.extent | 11 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | American Physical Society | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.80.123007 | - |
dc.relation.ispartof | Physical Review D, 2009, vol. 80, num. 12, p. 123007 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevD.80.123007 | - |
dc.rights | (c) American Physical Society, 2009 | - |
dc.source | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) | - |
dc.subject.classification | Física de partícules | - |
dc.subject.classification | Experiments | - |
dc.subject.classification | Ones de gravetat | - |
dc.subject.other | Particle physics | - |
dc.subject.other | Experiments | - |
dc.subject.other | Gravity waves | - |
dc.title | Non-Gaussianity and the CMB bispectrum: Confusion between primordial and lensing-Rees-Sciama contribution? | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 603912 | - |
dc.date.updated | 2019-04-08T11:02:21Z | - |
dc.relation.projectID | info:eu-repo/grantAgreement/EC/FP7/202182/EU//ACT | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Publicacions de projectes de recerca finançats per la UE |
Files in This Item:
File | Description | Size | Format | |
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603912.pdf | 387.59 kB | Adobe PDF | View/Open |
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