Multiple scalar particle decay and perturbation generation

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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.

Original languageEnglish
Title of host publicationParticles, Strings, and Cosmology - 13th International Symposium on Particles, Strings, and Cosmology, PASCOS 2007
Number of pages4
StatePublished - 2007
Event13th International Symposium on Particles, Strings and Cosmology, PASCOS 2007 - London, United Kingdom
Duration: 2 Jul 20077 Jul 2007

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference13th International Symposium on Particles, Strings and Cosmology, PASCOS 2007
Country/TerritoryUnited Kingdom


  • Cosmological perturbation theory
  • Curvaton


Dive into the research topics of 'Multiple scalar particle decay and perturbation generation'. Together they form a unique fingerprint.

Cite this