https://doi.org/10.1140/epjc/s10052-012-1902-8
Regular Article - Theoretical Physics
Towards flavour-diffusion coefficient and electrical conductivity without ultraviolet contamination
1
Institute for Theoretical Physics, Albert Einstein Center, University of Bern, Sidlerstrasse 5, 3012, Bern, Switzerland
2
Faculty of Physics, University of Bielefeld, 33501, Bielefeld, Germany
* e-mail: laine@physik.uni-bielefeld.de
Received:
12
January
2012
Revised:
3
February
2012
Published online:
23
February
2012
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 (2πTD≳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.
© Springer-Verlag / Società Italiana di Fisica, 2012
