COSMOLOGICAL EVOLUTION OF GENERIC EARLY-DECAYING PARTICLES AND THEIR DAUGHTERS

Authors
KANG HS KAWASAKI M STEIGMAN G
Citation
Hs. Kang et al., COSMOLOGICAL EVOLUTION OF GENERIC EARLY-DECAYING PARTICLES AND THEIR DAUGHTERS, Nuclear physics. B, 402(1-2), 1993, pp. 323-348
Citations number
35
Categorie Soggetti
Physics, Nuclear
Journal title
Nuclear physics. B → ACNP
ISSN journal
05503213
Volume
402
Issue
1-2
Year of publication
1993
Pages
323 - 348
Database
ISI
SICI code
0550-3213(1993)402:1-2<323:CEOGEP>2.0.ZU;2-C
Abstract
We have derived a set of simplified Boltzmann equations to study the c osmological evolution of early-decaying particles, as well as of their decay products, with particular emphasis on decays which occur when t he decaying particles are relativistic. Inverse decay and time dilatio n are explicitly included in the Boltzmann equations. In addition, the evolution of the effective number of neutrino species (N(nu)) due to the decay has been calculated as a function of the properties of the e arly-decaying particles.