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Effective Field Theory of non-Attractor Inflation · Around

2015

Effective Field Theory of non-Attractor Inflation

Akhshik, Mohammad, Firouzjahi, Hassan, Jazayeri, Sadra

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We present the model-independent studies of non attractor inflation in the context of effective field theory (EFT) of inflation.

Within the EFT approach two independent branches of non-attractor inflation solutions are discovered in which a near scale-invariant curvature perturbation power spectrum is generated from the interplay between the variation of sound speed and the second slow roll parameter \eta.
The first branch captures and extends the previously studied models of non-attractor inflation in which the curvature perturbation is not frozen on super-horizon scales and the single field non-Gaussianity consistency condition is violated.
We present the general expression for the amplitude of local-type non-Gaussianity in this branch.

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