The Matter Bounce Curvaton Scenario
Jan, 2011
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Abstract: (arXiv)
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.Note:
- 15 pages, 4 figs; a few references added
- 98.80.Cq
- curvature: fluctuation
- fluctuation: spectrum
- fluctuation: adiabatic
- field theory: scalar: massless
- vacuum state: quantum
- scaling: invariance
- bounce
- non-Gaussianity
- curvaton
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