| Domaine : |
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| Titre : |
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Hunting for Isocurvature Modes in the CMB non-Gaussianities |
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| Auteur(s) : |
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D. Langlois1, 2, Bartjan Van Tent3 |
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| Laboratoire : |
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| équipe(s) de recherche : |
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APC - THEORIE |
| Résumé : |
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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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Langue du texte
intégral : |
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Anglais |
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Date de production,
écriture : |
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13/04/2011 |
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| Journal : |
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| Classical and Quantum Gravity (Class. Quantum Gravity) |
| Publisher |
Institute of Physics: Hybrid Open Access |
| ISSN |
0264-9381 (eISSN : 1361-6382) |
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| Audience : |
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internationale |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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| Date de publication : |
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2011 |
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| Volume : |
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28 |
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| Numéro : |
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22 |
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| Page, identifiant, ... : |
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222001 |
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| Commentaire : |
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4 pages, 1 figure |
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| Référence interne : |
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LPT-ORSAY 11-36 |
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