期刊
ADVANCES IN ASTRONOMY
卷 2010, 期 -, 页码 -出版社
HINDAWI LTD
DOI: 10.1155/2010/724525
关键词
-
资金
- Korea Research Foundation - Korean Government [KRF-2008-341-C00008]
- Brain Korea 21 Project
We review models which generate a large non-Gaussianity of the local form. We first briefly consider three models which generate the non-Gaussianity either at or after the end of inflation; the curvaton scenario, modulated (p) reheating, and an inhomogeneous end of inflation. We then focus on ways of generating the non-Gaussianity during inflation. We derive general conditions which a product or sum separable potential must satisfy in order to generate a large local bispectrum during slow-roll inflation. As an application, we consider two-field hybrid inflation. We then derive a formalism not based on slow roll which can be applied to models in which the slow-roll parameters become large before inflation ends. An exactly soluble two-field model is given in which this happens. Finally, we also consider further non-Gaussian observables, a scale dependence of f(NL) and the trispectrum.
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