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 1/t3. These results may have relevance for instance in the context of lepton number violation in the early Universe.
|Number of pages||7652621|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Issue number||8 B|
|Publication status||Published - Apr 15 2002|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)