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Título: | Conditions for large non-Gaussianity in two-field slow-roll inflation |
Autor: | Byrnes, Christian T.; Choi, Ki-Young CSIC; Hall, Lisa M. H. | Palabras clave: | Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory |
Fecha de publicación: | 7-jul-2008 | Citación: | arXiv:0807.1101v1 [astro-ph] | Serie: | IFT-UAM/CSIC-08-42 FTUAM 08/8 HD-THEP-08-16 |
Resumen: | We study the level of primordial non-Gaussianity in slow-roll two-field inflation. Using an analytic formula for the nonlinear parameter f_NL in the case of a sum or product separable potential, we find that it is possible to generate significant non-Gaussianity even during slow-roll inflation with Gaussian perturbations at Hubble exit. In this paper we give the general conditions to obtain large non-Gaussianity and calculate the level of fine-tuning required to obtain this. We present explicit models in which the non-Gaussianity at the end of inflation can exceed the current observational bound of |f_NL|<100. | Descripción: | 16 pages, 6 figures, 1 table.-- PACS number: 98.80.Cq. | URI: | http://hdl.handle.net/10261/6842 |
Aparece en las colecciones: | (IFT) Artículos |
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