Trispectrum from ghost inflation
- Institute for the Physics and Mathematics of the Universe (IPMU), The University of Tokyo, Kashiwa, Chiba 277-8582 (Japan)
Ghost inflation predicts almost scale-invariant primordial cosmological perturbations with relatively large non-Gaussianity. The bispectrum is known to have a large contribution at the wavenumbers forming an equilateral triangle and the corresponding nonlinear parameter f{sub NL}{sup equil} is typically of order O(10{sup 2}). In this paper we calculate trispectrum from ghost inflation and show that the corresponding nonlinear parameter τ{sub NL} is typically of order O(10{sup 4}). We investigate the shape dependence of the trispectrum and see that it has some features different from DBI inflation. Therefore, our result may be useful as a template to distinguish ghost inflation from other models of inflation by future experiments.
- OSTI ID:
- 22272916
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 06 Vol. 2010; ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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