Adiabaticity and the Fate of Non-Gaussianities: The Trispectrum and Beyond

Details Adiabaticity and the Fate of Non-Gaussianities: The Trispectrum and Beyond Adiabaticity and the Fate of Non-Gaussianities: The Trispectrum and Beyond

2011-04-27

arxiv.org/abs/1104.5238v3

Phys. Rev. D 84, 063522 (2011)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

v3: Updated to match published version, minor corrections throughout, 17 pages; v2: Corrected counting of higher order non-lin

Scientific paper

10.1103/PhysRevD.84.063522

Extending the analysis of [1011.4934] beyond the bispectrum, we explore the superhorizon generation of local non-gaussianities and their subsequent approach to adiabaticity. Working with a class of two field models of inflation with potentials amenable to treatment with the delta N formalism we find that, as is the case for f_{NL}^{local}, the local trispectrum parameters tau_{NL} and g_{NL} are exponentially driven toward values which are slow roll suppressed if the fluctuations are driven into an adiabatic mode by a phase of effectively single field inflation. We argue that general considerations should ensure that a similar behavior will hold for the local forms of higher point correlations as well.

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