Stimulated compton scattering in a plasma: II. Asymptotic behaviour-Bose condensations-onset of a final equilibrium state

Abstract

We develop further our previous study of the self-consistent kinetics of a closed system constituted by interacting gases of electrons and photons. We point out the existence of a low frequency region where the evolution of the radiation spectrum always leads to a Bose condensation. We describe this condensation. Then we study the asymptotic behaviour of the interaction, where the linear induced term in the photon kinetic equation (related to T e) becomes dominant. We point out a “blue diffusion”, which leads finally to “local stationary solutions” in the high frequency region: then a sequence of Bose Einstein distributions with a negative chemical potential, defined on high frequency intervals and identified with these local solutions, is believed to lead to the final equilibrium state of the system. We point out the interest of such “negative μ-B.E.D.” in UV or X-ray astronomy.