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Large Local Non-Gaussianity from General Single-field Inflation

We investigate the non-Gaussian signatures of ultra slow-roll inflation. The bispectrum and the trispectrum are calculated with general initial conditions. The trispectrum is of local shape, as in the case of the bispectrum. We show that the prediction of local non-Gaussianity is robust again generalizing the Bunch-Davies vacuum. The Suyama-Yamaguchi relation is saturated in this scenario.

preprint2013arXivOpen access
Qing-Guo HuangYi Wang
astro-ph.COhep-phgr-qchep-th
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Qing-Guo HuangYi Wang

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