Christian Schmidt

Equation of state and QCD transition at finite temperature

We calculate the equation of state in

The QCD Equation of State with almost Physical Quark Masses

2+1

QCD thermal phase transition in the presence of a small chemical potential

flavor QCD at finite temperature with physical strange quark mass and almost physical light quark masses using lattices with temporal extent

Equation of state in ( 2+1 )-flavor QCD

{N}_{ensuremath{tau}}=8

Equation of state for two flavor QCD at nonzero chemical potential

. Calculations have been performed with two different improved staggered fermion actions, the asqtad and p4 actions. Overall, we find good agreement between results obtained with these two

The transition temperature in QCD

O({a}^{2})

Baryon Number, Strangeness and Electric Charge Fluctuations in QCD at High Temperature

improved staggered fermion discretization schemes. A comparison with earlier calculations on coarser lattices is performed to quantify systematic errors in current studies of the equation of state. We also present results for observables that are sensitive to deconfining and chiral aspects of the QCD transition on

Equation of State for physical quark masses

{N}_{ensuremath{tau}}=6

Fluctuations and correlations of net baryon number, electric charge, and strangeness: A comparison of lattice QCD results with the hadron resonance gas model

and 8 lattices. We find that deconfinement and chiral symmetry restoration happen in the same narrow temperature interval. In an appendix we present a simple parametrization of the equation of state that can easily be used in hydrodynamic model calculations. In this parametrization we include an estimate of current uncertainties in the lattice calculations which arise from cutoff and quark mass effects.

Freeze-out Conditions in Heavy Ion Collisions from QCD Thermodynamics

We present results on the equation of state in QCD with two light quark flavors and a heavier strange quark. Calculations with improved staggered fermions have been performed on lattices with temporal extent N{sub {tau}}=4 and 6 on a line of constant physics with almost physical quark mass values; the pion mass is about 220 MeV, and the strange quark mass is adjusted to its physical value. High statistics results on large lattices are obtained for bulk thermodynamic observables, i.e. pressure, energy and entropy density, at vanishing quark chemical potential for a wide range of temperatures, 140 MeV{<=}T{<=}800 MeV. We present a detailed discussion of finite cutoff effects which become particularly significant for temperatures larger than about twice the transition temperature. At these high temperatures we also performed calculations of the trace anomaly on lattices with temporal extent N{sub {tau}}=8. Furthermore, we have performed an extensive analysis of zero temperature observables including the light and strange quark condensates and the static quark potential at zero temperature. These are used to set the temperature scale for thermodynamic observables and to calculate renormalized observables that are sensitive to deconfinement and chiral symmetry restoration and become order parameters in the infinite and zeromorexa0» quark mass limits, respect0011ive.«xa0less