More on the Non-Gaussianity of Perturbations in a Nonminimal Inflationary Model
| Autor: | Farhad Darabi, Kourosh Nozari, Raheleh Shojaee |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Inflation (cosmology)
Physics Nuclear and High Energy Physics Cosmology and Nongalactic Astrophysics (astro-ph.CO) Article Subject 010308 nuclear & particles physics FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Lambda 01 natural sciences Action (physics) General Relativity and Quantum Cosmology lcsh:QC1-999 Nonlinear system Amplitude Coupling parameter Non-Gaussianity 0103 physical sciences 010306 general physics Scalar field lcsh:Physics Mathematical physics Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Advances in High Energy Physics, Vol 2018 (2018) Advances in High Energy Physics |
| ISSN: | 1687-7365 1687-7357 |
| Popis: | We study nonlinear cosmological perturbations and their possible non-Gaussian character in an extended non-minimal inflation where gravity is coupled non-minimally to both the scalar field and its derivatives. By expansion of the action up to the third order, we focus on the non-linearity and non-Gaussianity of perturbations in comparison with recent observational data. By adopting an inflation potential of the form V(phi) = (1/n)(lambda)(phi)^n, we show that for n = 4, for instance, this extended model is consistent with observation if 0.013 Comment: 15 pages, 2 figures |
| Databáze: | OpenAIRE |
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