Primordial non-Gaussianities from multiple-field inflation

By D. Seery, J. Lidsey. 2005

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We calculate the three-point correlation function evaluated at horizon crossing for a set of interacting scalar fields coupled to gravity during inflation. This provides the initial condition for the three-point function of the curvature perturbation in the Sasaki–Stewart δN formulation. We find that the effect is small, of the order of a slow-roll parameter, and that the non-Gaussianity can be determined on large scales once the unperturbed background evolution is known. As an example of the use of our formalism, we calculate the primordial non-Gaussianity arising in a model of assisted inflation.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/a6a568a6706f4f1ae3da5f0036427870c7ad2896

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Citations in the corpus

Non-linear isocurvature perturbations and non-Gaussianities (2008, background): “From the results of [26], namely 〈δφ∗(k1)δφ∗ (k2)δφ∗ (~k3)〉 = (2π)(3)δ(Σi~ki) H4 ∗ 16M2 P ∑”
Primordial Non-Gaussianities from Inflation Models (2010, background): “Gaussianities from other directions to the inflaton direction [127–134].”
Non-Gaussianities in multi-field inflation (2006, methodology): “This formalism was proposed by Starobinsky [19] and further developed by Sasaki and Stewart in [20], and others in [16, 17, 21].”
Phenomenology of a pseudo-scalar inflaton: naturally large nongaussianity (2011, methodology): “As expected, this coincides with the well-known result for single field inflation [41, 42].”