Trispectrum from Ghost Inflation
Keisuke Izumi, Shinji Mukohyama

TL;DR
This paper calculates the trispectrum in ghost inflation, revealing a large non-Gaussianity parameter and distinctive shape features that can help differentiate it from other inflation models in future observations.
Contribution
The paper provides the first detailed calculation of the trispectrum in ghost inflation, highlighting its unique shape dependence and large non-Gaussianity parameter , offering a potential observational signature.
Findings
order of magnitude for in ghost inflation
Distinct shape features of the trispectrum compared to DBI inflation
Potential for future experiments to distinguish ghost inflation
Abstract
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 is typically of order . In this paper we calculate trispectrum from ghost inflation and show that the corresponding nonlinear parameter is typically of order . 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.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
