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| HAL : hal-00589058, version 1 |
| arXiv : 1104.2567 |
| Code Bibliographique ADS : 2011CQGra..28v2001L |
| DOI : 10.1088/0264-9381/28/22/222001 |
| Fiche détaillée |  Récupérer au format |
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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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| Domaine | : | Physique/Relativité Générale et Cosmologie Quantique Physique/Physique des Hautes Energies - Théorie |
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| Lien vers le texte intégral : |
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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 | |
| Contributeur : Patricia Dubois-Violette | |
| Soumis le : Mercredi 27 Avril 2011, 12:56:59 | |
| Dernière modification le : Jeudi 28 Juin 2012, 14:22:04 | |
