Lattice study of classical inflaton decay

Details Lattice study of classical inflaton decay Lattice study of classical inflaton decay

1996-10-17

arxiv.org/abs/hep-ph/9610400v5

Phys.Rev. D55 (1997) 3768-3775

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages LaTeX with standard RevTex macros, uses epsf.sty. 7 postscript figures (included). No changes. Replaced to correct a

Scientific paper

10.1103/PhysRevD.55.3768

We study numerically the decay of the inflaton by solving the full non-linear equations of motion on the lattice. We confirm that parametric resonance is effective in transferring energy from the inflaton to a scalar field as long as the self-interactions of the second field are very small. However, in the very broad resonance case (q>>1) the decay rate is limited by scatterings, which significantly slows down the decay. We also find that the inflaton cannot decay via parametric resonance into a scalar field with moderate self-interactions. This means that the preheating stage may be completely absent in many natural inflationary models.

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