Lattice calculation of non-Gaussianity from preheating

Details Lattice calculation of non-Gaussianity from preheating Lattice calculation of non-Gaussianity from preheating

2007-10-22

arxiv.org/abs/0710.4133v3

Phys.Rev.Lett.100:041302,2008; Erratum-ibid.101:149903,2008

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure; erratum added

Scientific paper

10.1103/PhysRevLett.100.041302

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 that preheating can be an important factor in assessing the viability of inflationary models.

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