Review of Local Non-Gaussianity from Multifield Inflation
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...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2010-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2010/724525 |
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| Summary: | 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 fNL and
the trispectrum. |
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| ISSN: | 1687-7969 1687-7977 |