Curvature perturbation from velocity modulation

Kazunori Nakayama, Teruaki Suyama

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We propose a new variant model of the modulated reheating. If particles have large scale fluctuations on their velocities, or equivalently their Lorentz factors, the decay rate also fluctuates and the curvature perturbation is induced via their decay processes in analogy with modulated reheating. For example, if they are produced nonthermally by the decay of another field with its mass fluctuating on large scales, such a situation is realized. We explicitly calculate the resulting curvature perturbation and nonlinearity parameters and show that the effect of velocity-modulation is not negligible if the particles are semirelativistic at the decay.

Original languageEnglish
Article number063520
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number6
Publication statusPublished - 2011 Sept 22
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Curvature perturbation from velocity modulation'. Together they form a unique fingerprint.

Cite this