Time evolution in linear response: Boltzmann equations and beyond

Research output: Contribution to journalArticle


In this work a perturbative linear response analysis is performed for the time evolution of the “quasiconserved” charge of a scalar field. One can find two regimes, one follows exponential damping, where the damping rate is shown to come from quantum Boltzmann equations. The other regime (coming from multiparticle cuts) decays as power law. The most important, nonoscillating contribution in our model comes from a four-particle intermediate state and decays as (Formula presented) These results may have relevance for instance in the context of lepton number violation in the early Universe.

Original languageEnglish
Number of pages1
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number8
Publication statusPublished - Jan 1 2002

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Time evolution in linear response: Boltzmann equations and beyond'. Together they form a unique fingerprint.

  • Cite this