| Автор | Joseph Elliston |
| Автор | David J. Mulryne |
| Автор | David Seery |
| Автор | Reza Tavakol |
| Дата выпуска | 2011-11-01 |
| dc.description | We study inflationary perturbations in multiple-field models, for which ζ typically evolves until all isocurvature modes decay — the “adiabatic limit”. We use numerical methods to explore the sensitivity of the local-shape bispectrum to the process by which this limit is achieved, finding an appreciable dependence on model-specific data such as the time at which slow-roll breaks down or the timescale of reheating. In models with a sum-separable potential where the isocurvature modes decay before the end of the slow-roll phase we give an analytic criterion for the asymptotic value of f<sub>NL</sub> to be large. Other examples can be constructed using a waterfall field to terminate inflation while f<sub>NL</sub> is transiently large, caused by descent from a ridge or convergence into a valley. We show that these two types of evolution are distinguished by the sign of the bispectrum, and give approximate expressions for the peak f<sub>NL</sub>. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Evolution of f<sub>NL</sub> to the adiabatic limit |
| Тип | paper |
| DOI | 10.1088/1475-7516/2011/11/005 |
| Electronic ISSN | 1475-7516 |
| Журнал | Journal of Cosmology and Astroparticle Physics |
| Том | 2011 |
| Первая страница | 5 |
| Последняя страница | 005 |
| Выпуск | 11 |
