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arxiv 1303.4526 v1 pith:4YBMXAXE submitted 2013-03-19 hep-th astro-ph.COgr-qchep-ph

Large Local Non-Gaussianity from General Single-field Inflation

Qing-Guo Huang , Yi Wang This is my paper
classification hep-th astro-ph.COgr-qchep-ph
keywords localbispectrumgeneralinflationnon-gaussianitytrispectrumbunch-daviescalculated
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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  1. Multi-soft theorems for cosmological correlators: Background wave method for scalars & gravitons

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    Tree-level multi-soft theorems for scalar and graviton correlation functions are derived at leading soft order via background-wave coordinate rescaling, including tensor exchanges in scalars and scalar exchanges in tensors.