Strangeness at high temperature: from hadrons to quarks

Who: Christian Schmidt (University of Bielefeld)
When: Tuesday, May 7, 2013 at 11:00
Where: BMB’s seminar room

We report on the calculations of cumulants of conserved charge fluctuations within lattice regularized QCD at high temperatures on GPUs. We show how appropriate combinations of up to fourth order cumulants of net strangeness fluctuations and their correlations with net baryon number and electric charge fluctuations, can be used to probe the strangeness carrying degrees of freedom at high temperatures. For temperatures up to the chiral crossover, separate contributions of strange mesons and baryons can be well described by an uncorrelated gas of hadrons.

Such a description breaks down in the chiral crossover region, suggesting that the deconfinement of strangeness takes place at the chiral crossover. On the other hand, the strangeness carrying degrees of freedom inside the quark gluon plasma can be described by a weakly interacting gas of quarks only for temperatures larger than twice the chiral crossover temperature.

Furthermore, we will address issues that are related with the optimization of bandwidth limited QCD codes on GPUs.