Multiple scalar particle decay and perturbation generation

Details Multiple scalar particle decay and perturbation generation Multiple scalar particle decay and perturbation generation

2007-04-23

arxiv.org/abs/0704.2939v2

JCAP 0706:007,2007

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1088/1475-7516/2007/06/007

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.

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