Multiple scalar particle decay and perturbation generation

Abstract

We study the evolution of the universe which contains a multiple number of non-relativistic scalar fields decaying into both radiation and pressureless matter. We present a powerful analytic formalism to calculate the matter and radiation curvature perturbations, and find that our analytic estimates agree with full numerical results within an error of less than one percent. Also we discuss the isocurvature perturbation between matter and radiation components, which may be detected by near future cosmological observations, and point out that it crucially depends on the branching ratio of the decay rate of the scalar fields and that it is hard to make any model independent predictions.

(v1) 22 pages, 4 figures, 2 tables; (v2) JHEP3 style, 24 pages, references added and typos corrected, to appear in JCAP

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Cited by in corpus (16)

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• Local non-Gaussianity from inflation
• Inflation with multiple sound speeds: a model of multiple DBI type actions and non-Gaussianities
• On Classification of Models of Large Local-Type Non-Gaussianity
• Primordial non-Gaussianity from two curvaton decays
• N-flation from multiple DBI type actions
• N-vaton
• General treatment of isocurvature perturbations and non-Gaussianities
• Runnings in the Curvaton
• Density Perturbations from Modulated Decay of the Curvaton
• Can Standard Model Higgs Seed the Formation of Structures in Our Universe?
• Evolution of the curvature perturbation during and after multi-field inflation
• Temporal enhancement of super-horizon curvature perturbations from decays of two curvatons and its cosmological consequences
• Non-Gaussianity and gravitational wave background in curvaton with a double well potential
• Dynamics of Cosmological Perturbations in Multi-Speed Inflation
• Generation of perturbation after multi-field inflation