2013/10/28 by Amato, Alessandro, Aarts, Gert, Allton, Chris +3
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.1310.7466
The FASTSUM collaboration presents a study on the temperature dependence of the electrical conductivity σ in the quark-gluon plasma, using the methods of lattice QCD. Correlators of the exactly conserved vector current are measured at different temperatures across the deconfinement transition, using ensembles of 2+1 flavours of dynamical fermions on anisotropic lattices. We then employ bayesian methods (MEM) to extract the relevant spectral functions, which are found to be consistent with σ/T rising as a function of T. The robustness of the results is verified by a detailed analysis of the systematics involved in the bayesian reconstruction of the spectral functions.