10.1016/S0370-2693(00)00292-6
Karsch, Frithjof
Frithjof
Karsch
Laermann, Edwin
Edwin
Laermann
Peikert, A
A
Peikert
The pressure in 2, 2+1 and 3 flavour QCD
ELSEVIER SCIENCE BV
2000
2010-04-28T13:04:41Z
2018-07-24T12:57:58Z
journal_article
https://pub.uni-bielefeld.de/record/1620114
https://pub.uni-bielefeld.de/record/1620114.json
We calculate the pressure in QCD with two and three light quarks on a lattice of size 16(3) X 4 using tree level improved gauge and fermion actions. We argue that, for temperatures T greater than or similar to 2T(c), systematic effects due to the finite lattice cut-off and non-vanishing quark masses are below 15% in this calculation and give an estimate for the continuum-extrapolated pressure in QCD with massless quarks. We find that the flavour dependence of the pressure is dominated by that of the Stefan-Boltzmann constant. Furthermore we perform a calculation of the pressure using two light (m(u,d)/T = 0.4) and one heavier quark (m(s)/T = 1). In this case the pressure is reduced with respect to that of 3-flavour QCD. This effect is stronger than expected from the mass dependence of an ideal Fermi gas. (C) 2000 Elsevier Science B.V. All rights reserved.