TY  - JOUR
AB  - 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.
DA  - 2010
DO  - 10.1155/2010/724525
LA  - eng
M2  - 1
PY  - 2010
SN  - 1687-7969
SP  - 1-18
T2  - Advances in astronomy
TI  - Review of local non-Gaussianity from multi-field inflation
UR  - https://nbn-resolving.org/urn:nbn:de:0070-pub-18571035
Y2  - 2024-11-21T18:11:33
ER  -