Trispectrum from Ghost Inflation

@inproceedings{Izumi2010TrispectrumFG,
  title={Trispectrum from Ghost Inflation},
  author={Keisuke Izumi and Shinji Mukohyama},
  year={2010}
}
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 fNLequil is typically of order O(102). In this paper we calculate trispectrum from ghost inflation and show that the corresponding nonlinear parameter τNL is typically of order O(104). We investigate the shape dependence of the… CONTINUE READING

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