Weak and strong coupling equilibration in nonabelian gauge theories
Keegan, L., Kurkela, A., Romatschke, P., van der Schee, W., & Zhu, Y. (2016). Weak and strong coupling equilibration in nonabelian gauge theories. Journal of High Energy Physics, 2016 (4), 31. doi:10.1007/JHEP04(2016)031
Published inJournal of High Energy Physics
© The Author(s) 2016. Co-published with JHEP. This is an open-access article funded by SCOAP3 and licensed under CC BY 4.0.
We present a direct comparison studying equilibration through kinetic theory at weak coupling and through holography at strong coupling in the same set-up. The set-up starts with a homogeneous thermal state, which then smoothly transitions through an outof-equilibrium phase to an expanding system undergoing boost-invariant flow. This first apples-to-apples comparison of equilibration provides a benchmark for similar equilibration processes in heavy-ion collisions, where the equilibration mechanism is still under debate. We find that results at weak and strong coupling can be smoothly connected by simple, empirical power-laws for the viscosity, equilibration time and entropy production of the system.