Intuitive understanding of non-gaussianity in ekpyrotic and cyclic models

@inproceedings{LehnersIntuitiveUO,
  title={Intuitive understanding of non-gaussianity in ekpyrotic and cyclic models},
  author={Jean-Luc Lehners and Paul J. Steinhardt}
}
It has been pointed out by several groups that ekpyrotic and cyclic models generate significant nongaussianity. In this paper, we present a physically intuitive, semi-analytic estimate of the bispectrum. We show that, in all such models, there is an intrinsic contribution to the non-gaussianity parameter fNL that is determined by the geometric mean of the equation of state wek during the ekpyrotic phase and wc during the phase that curvature perturbations are generated and whose value is O(100… CONTINUE READING
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