Speaker
Dr
Akihiro Nishiyama
(University of Tsukuba)
Description
In this presentation, we propose the Kadanoff-Baym approach to the early nonequilibrium stage of ultrarelativistic heavy ion collisions and present recent results about equilibration of gluons. First we introduce the Kadanoff-Baym equation and present the proof of H-theorem for given off-shell dynamics of gluons. Next we show entropy production and equilibration with numerical analyses of this equation. Here we have adopted off-shell $g\leftrightarrow gg$ effects as scattering processes which are prohibited in normal quasiparticle approximation. Finally we estimate the equilibration time (~1fm/c) of gluons for the coupling strength $g^2=1.0$ and show the significance of off-shell effects in heavy ion collisions at RHIC and LHC energies.
Primary author
Dr
Akihiro Nishiyama
(University of Tsukuba)
