The inflationary trispectrum

@article{Seery2006TheIT,
  title={The inflationary trispectrum},
  author={David Seery and James E. Lidsey and Martin S. Sloth},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2006},
  volume={2007},
  pages={027 - 027}
}
We calculate the trispectrum of the primordial curvature perturbation generated by an epoch of slow-roll inflation in the early universe, and demonstrate that the non-Gaussian signature imprinted at horizon crossing is unobservably small, of order τNL ≲ r/50, where r < 1 is the tensor-to-scalar ratio. Therefore any primordial non-Gaussianity observed in future microwave background experiments is likely to have been synthesized by gravitational effects on superhorizon scales. We discuss the… 
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