Using a Classical Gluon Cascade to study the Equilibration of a Gluon-Plasma

High Energy Particle Physics Workshop 2015

McConnell, Lucas^1

Department of Physics, University of Cape Town, South Africa^1

关键词: Gluon plasmas;    Increasing temperatures;    Strong coupling;    Thermalisation;    Time evolutions;    Two directions;    Z-directions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/645/1/012013/pdf
DOI  :  10.1088/1742-6596/645/1/012013

来源: IOP

【 摘 要 】

Using a classical gluon cascade, we study the thermalisation of a gluon-plasma in a homogeneous box by considering the time evolution of the entropy, and in particular how the thermalisation time depends on the strong coupling αs. We then partition the volume into cells with a linearly increasing temperature gradient in one direction, and homogeneous/isotropic in the the other two directions. We allow the gluons to stream in one direction in order to study how they then evolve spatially. We examine cases with and without collisions. We study the entropy as well as the flow-velocity in the z-direction and find that the system initially has a flow which dissipates over time as the gluons become distributed homogeneously throughout the box.