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| HAL: hal-00589058, version 1 |
| arXiv: 1104.2567 |
| ADS Bibliographic id: 2011CQGra..28v2001L |
| DOI: 10.1088/0264-9381/28/22/222001 |
| Detailed view |  Export this paper |
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| Classical and Quantum Gravity 28, 22 (2011) 222001 |
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| Hunting for Isocurvature Modes in the CMB non-Gaussianities |
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| D. Langlois1, 2Bartjan Van Tent3 |
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| (2011) |
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| We investigate new shapes of local primordial non-Gaussianities in the CMB. Allowing for a primordial isocurvature mode along with the main adiabatic one, the angular bispectrum is in general a superposition of six distinct shapes: the usual adiabatic term, a purely isocurvature component and four additional components that arise from correlations between the adiabatic and isocurvature modes. We present a class of early Universe models in which various hierarchies between these six components can be obtained, while satisfying the present upper bound on the isocurvature fraction in the power spectrum. Remarkably, even with this constraint, detectable non-Gaussianity could be produced by isocurvature modes. We finally discuss the prospects of detecting these new shapes with the Planck satellite. |
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| 1: | APC - AstroParticule et Cosmologie |
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| 2: | IAP - Institut d'Astrophysique de Paris |
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| 3: | LPT - Laboratoire de Physique Théorique d'Orsay |
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| APC - THEORIE |
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| Subject | : | Physics/General Relativity and Quantum Cosmology Physics/High Energy Physics - Theory |
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| Fulltext link: |
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| http://fr.arXiv.org/abs/1104.2567 |
| hal-00589058, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00589058 | |
| oai:hal.archives-ouvertes.fr:hal-00589058 | |
| From: Patricia Dubois-Violette | |
| Submitted on: Wednesday, 27 April 2011 12:56:59 | |
| Updated on: Thursday, 28 June 2012 14:22:04 | |
