The matter bounce curvaton scenario

Journal Article · Tue Mar 01 04:00:00 EST 2011 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2011/03/003· OSTI ID:22275491

Cai, Yi-Fu ^[1]; Brandenberger, Robert; Zhang, Xinmin ^[2]

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1. Department of Physics, Arizona State University, P.O. Box 871504, Tempe, AZ 85287 (United States)
2. Institute of High Energy Physics, Chinese Academy of Sciences, P.O. Box 918-4, Beijing 100049 (China)

Massless scalar fields originating in a quantum vacuum state acquire a scale-invariant spectrum of fluctuations in a matter-dominated contracting universe. We show that these isocurvature fluctuations transfer to a scale-invariant spectrum of curvature fluctuations during a non-singular bounce phase. This provides a mechanism for enhancing the primordial adiabatic fluctuations and suppressing the ratio of tensor to scalar perturbations. Moreover, this mechanism leads to new sources of non-Gaussianity of curvature perturbations.

• OSTI ID: 22275491
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 03 Vol. 2011; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ASTROPHYSICS
COSMOLOGY
DISTURBANCES
FLUCTUATIONS
SCALAR FIELDS
SCALARS
TENSORS
UNIVERSE
VACUUM STATES