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| HAL : hal-00716137, version 1 |
| arXiv : 1007.5498 |
| Code Bibliographique ADS : 2011JCAP...01..008L |
| DOI : 10.1088/1475-7516/2011/01/008 |
| Fiche détaillée |  Récupérer au format |
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| Journal of Cosmology and Astroparticle Physics 01 (2011) 008 |
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| General treatment of isocurvature perturbations and non-Gaussianities |
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| D. Langlois1A. Lepidi1 |
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| (01/2011) |
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| We present a general formalism that provides a systematic computation of the linear and non-linear perturbations for an arbitrary number of cosmological fluids in the early Universe going through various transitions, in particular the decay of some species (such as a curvaton or a modulus). Using this formalism, we revisit the question of isocurvature non-Gaussianities in the mixed inflaton-curvaton scenario and show that one can obtain significant non-Gaussianities dominated by the isocurvature mode while satisfying the present constraints on the isocurvature contribution in the observed power spectrum. We also study two-curvaton scenarios, taking into account the production of dark matter, and investigate in which cases significant non-Gaussianities can be produced. |
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| 1 : | APC - AstroParticule et Cosmologie |
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| APC - THEORIE |
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| Domaine | : | Physique/Physique des Hautes Energies - Phénoménologie Physique/Physique des Hautes Energies - Théorie |
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| Lien vers le texte intégral : |
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| http://fr.arXiv.org/abs/1007.5498 |
| hal-00716137, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00716137 | |
| oai:hal.archives-ouvertes.fr:hal-00716137 | |
| Contributeur : David Langlois | |
| Soumis le : Mardi 10 Juillet 2012, 07:51:23 | |
| Dernière modification le : Mercredi 1 Août 2012, 16:02:40 | |
