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Paper   IPM / Astronomy / 13671
School of Astronomy
Title:   In-in and Î´N calculations of the bispectrum from non-attractor single-field inflation
Author(s):
 1 X. Chen 2 H. Firouzjahi 3 Eiichiro. Komatsu 4 M.H. Namjoo 5 M. Sasaki
Status:   Published
Journal: JCAP
Year:  2013
Supported by:  IPM
Abstract:
In non-attractor single-field inflation models producing a scale-invariant power spectrum, the curvature perturbation on super-horizon scales grows as a3. This is so far the only known class of self-consistent single-field models with a Bunch-Davies initial state that can produce a large squeezed-limit bispectrum violating Maldacena's consistency relation. Given the importance of this result, we calculate the bispectrum with three different methods: using quantum field theory calculations in two different gauges, and classical calculations (the Î´N formalism). All the results agree, giving the local-form bispectrum parameter of flocalNL= 5(1+cs2)/(4cs2). This result is valid for arbitrary values of the speed of sound parameter, cs, for a particular non-attractor model we consider in this paper.

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