Non-Gaussianities in New Ekpyrotic Cosmology
| dc.creator | Buchbinder, Evgeny I. | |
| dc.creator | Khoury, Justin | |
| dc.creator | Ovrut, Burt A. | |
| dc.date | 2007-10-26 | |
| dc.date | 2008-04-24 | |
| dc.date.accessioned | 2026-07-07T11:38:22Z | |
| dc.date.available | 2026-07-07T11:38:22Z | |
| dc.description | New Ekpyrotic Cosmology is an alternative scenario of the early universe which relies on a phase of slow contraction before the big bang. We calculate the 3-point and 4-point correlation functions of primordial density perturbations and find a generically large non-Gaussian signal, just below the current sensitivity level of CMB experiments. This is in contrast with slow-roll inflation, which predicts negligible non-Gaussianity. The model is also distinguishable from alternative inflationary scenarios that yield large non-Gaussianity, such as DBI inflation and the simplest curvaton-like models, through the shape dependence of the correlation functions. Non-Gaussianity therefore provides a distinguishing and testable prediction of New Ekpyrotic Cosmology. | |
| dc.description | 4 pages. v2: sign convention clarified, references added; v3: minor changes, version to appear in PRL | |
| dc.identifier | https://arxiv.org/abs/0710.5172 | |
| dc.identifier | http://arxiv.org/abs/0710.5172 | |
| dc.identifier | Phys.Rev.Lett.100:171302,2008 | |
| dc.identifier | doi:10.1103/PhysRevLett.100.171302 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/199537 | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Non-Gaussianities in New Ekpyrotic Cosmology | |
| dc.type | text |