1201.1994 (Y. Burnier et al.)

Towards flavour diffusion coefficient and electrical conductivity
without ultraviolet contamination    [PDF]

Y. Burnier, M. Laine

By subtracting from a recent lattice measurement of the thermal vector-current correlator the known 5-loop vacuum contribution, we demonstrate that the remainder is small and shows no visible short-distance divergence. It can therefore in principle be subjected to model-independent analytic continuation. Testing a particular implementation, we obtain estimates for the flavour-diffusion coefficient (2 pi T D \gsim 0.8) and electrical conductivity which are significantly smaller than previous results. Although systematic errors remain beyond control at present, some aspects of our approach could be of a wider applicability.

View original: http://arxiv.org/abs/1201.1994