Progress in Lattice QCD at finite temperature

I review recent developements in lattice QCD at finite temperature, including the determination of the transition temperature T_c, equation of state and diffenet static screening lengths. The lattice data suggest that at temperatures above 1.5T_c the quark gluon plasma can be considered as gas consisting of quarks and gluons.Comment: Talk presented at 23rd Winter Workshop on Nuclear Dynamics, Latex, 8 pages, 5 figures, uses bigsky2007.sty. Typos corrected, further discussion of Tc is adde

Progress in Lattice QCD at non-zero temperature and QGP

I review recent progress in lattice QCD at non-zero temperature whith emphasis on the calculations of equation and the deconfinement as well as the chiral aspects of the QCD transition at non-zero temperature. I also briefly discuss meson correlation functions at high temperatures.Comment: To appear in proceedings of Light Cone 2010, June 14-18, 2010 Valencia, Spai

Hadron Resonance Gas with Repulsive Interactions and Fluctuations of Conserved Charges

We discuss the role of repulsive baryon-baryon interactions in a hadron gas using relativistic virial expansion and repulsive mean field approaches. The fluctuations of the baryon number as well as strangeness-baryon correlations are calculated in the hadron resonance gas with repulsive interactions and compared with the recent lattice QCD results. In particular, we calculate the difference between the second and fourth order fluctuations and correlations of baryon number and strangeness, that have been proposed as probes of deconfinement. We show that for not too high temperatures these differences could be understood in terms of repulsive interactions.Comment: 12pages, 2 figures, ReVTeX, published version, unexpanded mean field results adde