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

Abstract

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.

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

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Cited by in corpus (22)

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• Natural Double Inflation in Supergravity
• Avoiding the blue spectrum and the fine-tuning of initial conditions in hybrid inflation
• Gravitational Waves and Primordial Black Holes from Supersymmetric Hybrid Inflation
• Double inflation in supergravity and the primordial black hole formation
• Density Fluctuations and Primordial Black Hole Formation in Natural Double Inflation in Supergravity
• Basics of inflationary cosmology
• Hybrid Inflation in Supergravity with $(SU(1,1)/U(1){)}^m$ Khler Manifolds
• Fine-Tuning Solution for Hybrid Inflation in Dissipative Chaotic Dynamics
• Standard-smooth hybrid inflation
• Realizations of Hybrid Inflation in Supergravity with natural initial conditions
• F-Term Hybrid Inflation Followed by a Peccei-Quinn Phase Transition
• Chaotic Symmetry Breaking and Dissipative Two-Field Dynamics
• Initial condition for new inflation in supergravity
• Supersymmetry breaking and loop corrections at the end of inflation
• Axion, mu Term, and Supersymmetric Hybrid Inflation
• Large Field Inflation in Supergravity
• Hybrid Inflation in Quasi-minimal Supergravity with Monotonic Inflationary Potentia
• Phenomenology and Cosmology of Supersymmetric Grand Unified Theories
• Double hybrid inflation and gravitational waves