Isocurvature modes in the CMB bispectrum

D. Langlois 1 Bartjan Van Tent 2
1 APC - THEORIE
IAP - Institut d'Astrophysique de Paris, APC - UMR 7164 - AstroParticule et Cosmologie
Abstract : We study the angular bispectrum of local type arising from the (possibly correlated) combination of a primordial adiabatic mode with an isocurvature one. Generically, this bispectrum can be decomposed into six elementary bispectra. We estimate how precisely CMB data, including polarization, can enable us to measure or constrain the six corresponding amplitudes, considering separately the four types of isocurvature modes (CDM, baryon, neutrino density, neutrino velocity). Finally, we discuss how the model-independent constraints on the bispectrum can be combined to get constraints on the parameters of multiple-field inflation models.
Document type :
Journal articles
Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2012, 07, pp.040. <10.1088/1475-7516/2012/07/040>


https://hal.archives-ouvertes.fr/hal-00692526
Contributor : Patricia Dubois-Violette <>
Submitted on : Monday, April 30, 2012 - 5:23:37 PM
Last modification on : Thursday, April 23, 2015 - 1:52:03 PM

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D. Langlois, Bartjan Van Tent. Isocurvature modes in the CMB bispectrum. Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2012, 07, pp.040. <10.1088/1475-7516/2012/07/040>. <hal-00692526>

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