Phys. Rev. Lett. 100, 041302 (2008) [4 pages]Lattice Calculation of Non-Gaussian Density Perturbations from the Massless Preheating Inflationary ModelSee Also: Erratum Received 29 October 2007; revised 5 December 2007; published 28 January 2008 If light scalar fields are present at the end of inflation, their nonequilibrium dynamics such as parametric resonance or a phase transition can produce non-Gaussian density perturbations. We show how these perturbations can be calculated using nonlinear 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.041302
DOI:
10.1103/PhysRevLett.100.041302
PACS:
98.80.Cq, 11.15.Kc
See AlsoErratum: Alex Chambers and Arttu Rajantie, Erratum: Lattice Calculation of Non-Gaussian Density Perturbations from the Massless Preheating Inflationary Model [Phys. Rev. Lett. 100, 041302 (2008)], Phys. Rev. Lett. 101, 149903 (2008). |
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