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Hunting for Isocurvature Modes in the CMB non-Gaussianities
Langlois D., Van Tent B.
Classical and Quantum Gravity 28, 22 (2011) 222001 - http://hal.archives-ouvertes.fr/hal-00589058
Physique/Relativité Générale et Cosmologie Quantique
Physique/Physique des Hautes Energies - Théorie
Hunting for Isocurvature Modes in the CMB non-Gaussianities
D. Langlois1, 2, Bartjan Van Tent3
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
http://www.apc.univ-paris7.fr/
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
France
2 :  IAP - Institut d'Astrophysique de Paris
http://www.iap.fr/
CNRS : UMR7095 – INSU – Université Pierre et Marie Curie (UPMC) - Paris VI
98bis, bd Arago - 75014 Paris France
France
3 :  LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
CNRS : UMR8627 – Université Paris XI - Paris Sud
Bâtiment 210 Université Paris XI 91405 Orsay Cedex
France
APC - THEORIE
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.
Anglais
13/04/2011

Classical and Quantum Gravity (Class. Quantum Gravity)
Publisher Institute of Physics: Hybrid Open Access
ISSN 0264-9381 (eISSN : 1361-6382)
internationale
Articles dans des revues avec comité de lecture
2011
28
22
222001

4 pages, 1 figure
LPT-ORSAY 11-36

Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1104.2567