Multiple scalar particle decays and perturbation generation

Ki Young Choi, Jinn Ouk Gong

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


We study the evolution of the universe which contains multiple non-relativistic scalar fields decaying into both radiation and pressureless matter. We present a powerful analytic formalism for calculating the matter and radiation curvature perturbations, and find that our analytic estimates agree with full numerical results within an error of less than one per cent. Also we discuss the isocurvature perturbation of 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.

Original languageEnglish
Article number007
JournalJournal of Cosmology and Astroparticle Physics
Issue number6
StatePublished - 1 Jun 2007


  • Cosmological perturbation theory
  • Physics of the early universe


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