Curvature perturbation and waterfall dynamics in hybrid inflation

Journal Article · Sat Oct 01 04:00:00 EDT 2011 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2011/10/015· OSTI ID:22280226

Abolhasani, Ali Akbar ^[1]; Firouzjahi, Hassan ^[2]; Sasaki, Misao ^[3]

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1. Department of Physics, Sharif University of Technology, Tehran (Iran, Islamic Republic of)
2. School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran (Iran, Islamic Republic of)
3. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)

We investigate the parameter spaces of hybrid inflation model with special attention paid to the dynamics of waterfall field and curvature perturbations induced from its quantum fluctuations. Depending on the inflaton field value at the time of phase transition and the sharpness of the phase transition inflation can have multiple extended stages. We find that for models with mild phase transition the induced curvature perturbation from the waterfall field is too large to satisfy the COBE normalization. We investigate the model parameter space where the curvature perturbations from the waterfall quantum fluctuations vary between the results of standard hybrid inflation and the results obtained here.

• OSTI ID: 22280226
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 10 Vol. 2011; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMOLOGY
DISTURBANCES
FLUCTUATIONS
INFLATIONARY UNIVERSE
INFLATONS
PHASE TRANSFORMATIONS
SPACE