Hunting for Isocurvature Modes in the CMB non-Gaussianities

D. Langlois 1 Bartjan Van Tent 2
1 APC - THEORIE
APC - UMR 7164 - AstroParticule et Cosmologie, Institut für theoretische Physik
Abstract : 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.
Type de document :
Article dans une revue
Classical and Quantum Gravity, IOP Publishing, 2011, 28 (22), pp.222001. 〈10.1088/0264-9381/28/22/222001〉
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https://hal.archives-ouvertes.fr/hal-00589058
Contributeur : Patricia Dubois-Violette <>
Soumis le : mercredi 27 avril 2011 - 12:56:59
Dernière modification le : jeudi 9 février 2017 - 16:06:46

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D. Langlois, Bartjan Van Tent. Hunting for Isocurvature Modes in the CMB non-Gaussianities. Classical and Quantum Gravity, IOP Publishing, 2011, 28 (22), pp.222001. 〈10.1088/0264-9381/28/22/222001〉. 〈hal-00589058〉

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