Conditions for large non-Gaussianity in two-field slow-roll inflation
By C. Byrnes, Kiwoon Choi, L. M. Hall. 2008
157 citations recorded by the source corpus.
We study the level of primordial non-Gaussianity in slow-roll two-field inflation. Using an analytic formula for the non-linear parameter fNL 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 for obtaining 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 .
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/a524191f4db58ff6c82f010251c44c0bf5d854c8
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
- M. Liguori
- Kiwoon Choi
- C. Byrnes
- J. Fergusson
- E. Shellard
- E. Sefusatti
- Evangelos Sfakianakis
- Edward A. Mazenc
In Nuclear and High Energy Physics
- Kiwoon Choi
- C. Byrnes
- J. Fergusson
- Evangelos Sfakianakis
- Edward A. Mazenc
- E. Sefusatti
- E. Shellard
- M. Liguori
Citations in the corpus
- Primordial Non-Gaussianity and Bispectrum Measurements in the Cosmic Microwave Background and Large-Scale Structure (2010, background): “, recent works in [15, 17, 31, 32] and references therein).”
- Primordial bispectrum from multifield inflation with nonminimal couplings (2012, background): “Unlike the product potential studied in [28, 30], the potential of Eq.”
- Review of local non-Gaussianity from multi-field inflation (2010, methodology): “[94, 95], and they showed that it is possible to generate observable large nonGaussianity even during slow-roll multifield inflation models and explicitly wrote the conditions as well as concrete examples (There is a claim [103] that the sizeable value of fNL can arise from a loop corrections).”