Non-Gaussianity from Inflation

By N. Bartolo, S. Matarrese, A. University, Infn Padova, S. University. 2001

205 citations recorded by the source corpus.

Correlated adiabatic and isocurvature perturbation modes are produced during inflation through an oscillation mechanism when extra scalar degrees of freedom -other than the inflaton field are present. We show that this correlation generically leads to sizeable non-Gaussian features both in the adiabatic and isocurvature perturbations. The nonGaussianity is first generated by large non-linearities in some scalar sector and then efficiently transferred to the inflaton sector by the oscillation process. We compute the cosmic microwave background angular bispectrum, providing a characteristic feature of such inflationary non-Gaussianity, which might be detected by upcoming satellite experiments.

Subfields: Astronomy and Astrophysics, Oceanography

View Paper: https://www.semanticscholar.org/paper/b9320e4b9484184f5de2a51e00e45e5b3d1a0774

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Citations in the corpus

Primordial Non-Gaussianities from Inflation Models (2010, background): “Gaussianities from other directions to the inflaton direction [127–134].”
On non-Gaussianities in single-field inflation (2003, background): “This possibility is realized in multiple-field models of inflation [8, 9], in the curvaton scenario [10] and in the recently proposed mechanism with curvature perturbations created by fluctuations of the decay rate of the inflaton [11, 12].”
First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Implications For Inflation (2003, background): “Both isocurvature and adiabatic perturbations receive significant contributions from at least one of the scalar fields to produce the correlation (Langlois 1999; Pierpaoli et al. 1999; Langlois & Riazuelo 2000; Gordon et al. 2001; Bartolo et al. 2001, 2002; Amendola et al. 2002; Wands et al. 2002).”
Measuring Primordial Non-Gaussianity in the Cosmic Microwave Background (2003, methodology): “A similar model may also apply to isocurvature perturbations, S (Bartolo et al. 2002).”
Planck 2015 results. XVII. Constraints on primordial non-Gaussianity (2015, unknown): “There is a broad literature on examples and specific realizations of this transfer mechanism from isocurvature to adiabatic perturbations (Bartolo et al. 2002; Bernardeau & Uzan 2002; Vernizzi & Wands 2006; Rigopoulos et al. 2006, 2007; Lyth & Rodriguez 2005; Tzavara & van Tent 2011; for a review on”