Preheating after N-flation

Details Preheating after N-flation Preheating after N-flation

2008-03-03

arxiv.org/abs/0803.0321v2

Phys.Rev.D77:123507,2008

Astronomy and Astrophysics

Astrophysics

14 pages, 14 figures, references added, fixed typos

Scientific paper

10.1103/PhysRevD.77.123507

We study preheating in N-flation, assuming the Mar\v{c}enko-Pastur mass distribution, equal energy initial conditions at the beginning of inflation and equal axion-matter couplings, where matter is taken to be a single, massless bosonic field. By numerical analysis we find that preheating via parametric resonance is suppressed, indicating that the old theory of perturbative preheating is applicable. While the tensor-to-scalar ratio, the non-Gaussianity parameters and the scalar spectral index computed for N-flation are similar to those in single field inflation (at least within an observationally viable parameter region), our results suggest that the physics of preheating can differ significantly from the single field case.

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