Review of local non-Gaussianity from multi-field inflation

Byrnes C, Choi K-Y (2010)
Advances in astronomy 2010: 1-18.

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Journal Article | Original Article | Published | English
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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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Byrnes C, Choi K-Y. Review of local non-Gaussianity from multi-field inflation. Advances in astronomy. 2010;2010:1-18.
Byrnes, C., & Choi, K. - Y. (2010). Review of local non-Gaussianity from multi-field inflation. Advances in astronomy, 2010, 1-18. doi:10.1155/2010/724525
Byrnes, C., and Choi, K. - Y. (2010). Review of local non-Gaussianity from multi-field inflation. Advances in astronomy 2010, 1-18.
Byrnes, C., & Choi, K.-Y., 2010. Review of local non-Gaussianity from multi-field inflation. Advances in astronomy, 2010, p 1-18.
C. Byrnes and K.-Y. Choi, “Review of local non-Gaussianity from multi-field inflation”, Advances in astronomy, vol. 2010, 2010, pp. 1-18.
Byrnes, C., Choi, K.-Y.: Review of local non-Gaussianity from multi-field inflation. Advances in astronomy. 2010, 1-18 (2010).
Byrnes, Christian, and Choi, K-Y. “Review of local non-Gaussianity from multi-field inflation”. Advances in astronomy 2010 (2010): 1-18.
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