Inhomogeneity and Nonlinear Preheating

Details Inhomogeneity and Nonlinear Preheating Inhomogeneity and Nonlinear Preheating

2001-05-30

arxiv.org/abs/gr-qc/0105117v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Talk given at Marcel Grossmann Meeting IX. 3 pages, 1 figure

Scientific paper

We investigated the possibility that nonlinear gravitational effects influence the preheating era after inflation, using numerical solutions of the inhomogeneous Einstein field equations. We compared our results to perturbative calculations and to solutions of the nonlinear field equations in a rigid (unperturbed) spacetime, in order to isolate gravitational phenomena. We confirm the broad picture of preheating obtained from the nonlinear field equations in a rigid background, but find gravitational effects have a measurable impact on the dynamics. The longest modes in the simulation grow much more rapidly in the relativistic calculation than with a rigid background. We used the Weyl tensor to quantify the departure from homogeneity in the universe. We saw no evidence for the sort of gravitational collapse that leads to the formation of primordial black holes.

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