Time evolution of cascade decay

摘要: We study non-perturbatively the time evolution of cascade decay for generic fields and obtain dependence amplitudes populations resonant final states. analyze in detail different scales manifestation unitary dynamics production intermediate The probability occupation (population) ‘flows’ as a function from initial to When width parent particle is much larger than that state there ‘bottleneck’ flow, population states builds up maximum at nearly saturating unitarity decays on longer scale . As consequence wide separation this case can be interpreted evolving sequentially In opposite limit resonances () does not build substantially proceeds almost directly without resulting large amplitude state. An alternative but equivalent non-perturbative method useful cosmology presented. Possible phenomenological implications heavy sterile neutrinos consequences quantum entanglement correlations are discussed.