Scale dependence of f{sub NL} in N-flation
Journal Article
·
· Journal of Cosmology and Astroparticle Physics
- Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190 (China)
Adopting the horizon-crossing approximation, we derive the spectral index of f{sub NL} in general N-flation model. Axion N-flation model is taken as a typical model for generating a large f{sub NL} which characterizes the size of local form bispectrum. We find that its tilt n{sub f{sub N{sub L}}} is negligibly small when all inflatons have the same potential, but a negative detectable n{sub f{sub N{sub L}}} can be achieved in the axion N-flation with different decay constants for different inflatons. The measurement of n{sub f{sub N{sub L}}} can be used to support or falsify the axion N-flation in the near future.
- OSTI ID:
- 22275414
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 12 Vol. 2010; ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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