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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| Format: | Article |
| Language: | English |
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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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| _version_ | 1849306341072437248 |
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| author | Christian T. Byrnes Ki-Young Choi |
| author_facet | Christian T. Byrnes Ki-Young Choi |
| author_sort | Christian T. Byrnes |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-2e9a0bc7144d47f7a40b64aff331b210 |
| institution | Kabale University |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2010-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-2e9a0bc7144d47f7a40b64aff331b2102025-08-20T03:55:07ZengWileyAdvances in Astronomy1687-79691687-79772010-01-01201010.1155/2010/724525724525Review of Local Non-Gaussianity from Multifield InflationChristian T. Byrnes0Ki-Young Choi1Fakultät für Physik, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, GermanyDepartment of Physics, Pusan National University, Busan 609-735, Republic of KoreaWe 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.http://dx.doi.org/10.1155/2010/724525 |
| spellingShingle | Christian T. Byrnes Ki-Young Choi Review of Local Non-Gaussianity from Multifield Inflation Advances in Astronomy |
| title | Review of Local Non-Gaussianity from Multifield Inflation |
| title_full | Review of Local Non-Gaussianity from Multifield Inflation |
| title_fullStr | Review of Local Non-Gaussianity from Multifield Inflation |
| title_full_unstemmed | Review of Local Non-Gaussianity from Multifield Inflation |
| title_short | Review of Local Non-Gaussianity from Multifield Inflation |
| title_sort | review of local non gaussianity from multifield inflation |
| url | http://dx.doi.org/10.1155/2010/724525 |
| work_keys_str_mv | AT christiantbyrnes reviewoflocalnongaussianityfrommultifieldinflation AT kiyoungchoi reviewoflocalnongaussianityfrommultifieldinflation |