Two-Stage Inflation as a Solution of the Initial Condition Problem of Hybrid Inflation

Details Two-Stage Inflation as a Solution of the Initial Condition Problem of Hybrid Inflation Two-Stage Inflation as a Solution of the Initial Condition Problem of Hybrid Inflation

1997-10-29

arxiv.org/abs/hep-ph/9710526v2

Phys.Rev.D59:083502,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, LaTeX, uses equation.sty, 4 figures in eps format

Scientific paper

10.1103/PhysRevD.59.083502

We address the issue of fine-tuning of the initial field configuration that can lead to hybrid inflation in the context of global supersymmetry. This problem is generated by the difference between the energy scale at which the Universe emerges from the Planck era and the inflationary scale implied by the COBE observations: V^{1/4} \sim 10^{-3} m_{Pl}. We propose a scenario with two stages of inflation. The first stage, with a typical scale not far from m_{Pl}, occurs ``naturally'' and provides the necessary homogeneity for the second stage. The latter generates the density perturbations that result in the cosmic microwave background anisotropy observed by COBE.

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