Lattice calculation of non-Gaussianity from preheating

@article{Chambers2007LatticeCO,
  title={Lattice calculation of non-Gaussianity from preheating},
  author={A. Chambers and A. Rajantie},
  journal={Physical Review Letters},
  year={2007},
  volume={100},
  pages={041302}
}
If light scalar fields are present at the end of inflation, their non-equilibrium dynamics such as parametric resonance or a phase transition can produce non-Gaussian density perturbations. We show how these perturbations can be calculated using non-linear lattice field theory simulations and the separate universe approximation. In the massless preheating model, we find that some parameter values are excluded while others lead to acceptable but observable levels of non-Gaussianity. This shows… Expand

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