Non-Gaussianity in braneworld and tachyon inflation
| dc.creator | Calcagni, Gianluca | |
| dc.date | 2004-11-29 | |
| dc.date | 2005-10-19 | |
| dc.date.accessioned | 2026-07-07T06:37:05Z | |
| dc.date.available | 2026-07-07T06:37:05Z | |
| dc.description | We calculate the bispectrum of single-field braneworld inflation, triggered by either an ordinary scalar field or a cosmological tachyon, by means of a gradient expansion of large-scale non-linear perturbations coupled to stochastic dynamics. The resulting effect is identical to that for single-field 4D standard inflation, the non-linearity parameter being proportional to the scalar spectral index in the limit of collapsing momentum. If the slow-roll approximation is assumed, braneworld and tachyon non-Gaussianities are subdominant with respect to the post-inflationary contribution. However, bulk physics may considerably strengthen the non-linear signatures. These features do not change significantly when considered in a non-commutative framework. | |
| dc.description | 17 pages; v2: added references and previously skipped details in the derivation of the result; v3: improved discussion | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0411773 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0411773 | |
| dc.identifier | JCAP 0510 (2005) 009 | |
| dc.identifier | doi:10.1088/1475-7516/2005/10/009 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/100273 | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Non-Gaussianity in braneworld and tachyon inflation | |
| dc.type | text |