Preheating and the Einstein Field Equations

Details Preheating and the Einstein Field Equations Preheating and the Einstein Field Equations

1998-09-29

arxiv.org/abs/hep-ph/9809574v3

Phys.Rev.D59:061301,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTeX, 5 pages, 3 figures. References added, typo in eq(16) corrected. To appear in Phys. Rev. D (Rapid Comm.)

Scientific paper

10.1103/PhysRevD.59.061301

We inaugurate a framework for studying preheating and parametric resonance after inflation without resorting to any approximations, either in gravitational perturbation theory or in the evolution of the field(s). We do this by numerically solving the Einstein field equations in the post-inflationary universe. In this letter we show how to compare our results to those of gauge invariant perturbation theory. We then verify Finelli and Brandenberger's analysis (hep-ph/9809490) of super-horizon modes in $m^2\phi^2$ inflation, showing that they are not amplified by resonant effects. Lastly, we make a preliminary survey of the nonlinear couplings between modes, which will be important in models where the primordial metric perturbations undergo parametric amplification.

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