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Transport equations for the inflationary trispectrum · Around

2012

Transport equations for the inflationary trispectrum

Anderson, Gemma J., Mulryne, David J., Seery, David

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We use transport techniques to calculate the trispectrum produced in multiple-field inflationary models with canonical kinetic terms.

Our method allows the time evolution of the local trispectrum parameters, tauNL and gNL, to be tracked throughout the inflationary phase.
We illustrate our approach using examples.
We give a simplified method to calculate the superhorizon part of the relation between field fluctuations on spatially flat hypersurfaces and the curvature perturbation on uniform density slices, and obtain its third-order part for the first time.

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