ar X iv : h ep - l at / 0 11 10 40 v 1 2 2 N ov 2 00 1 1 Zero temperature phase structure of multi - flavor QCD ∗
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چکیده
Perturbative analysis of QCD coupling constant renormalization tells us that the coefficients in the series expansion of the β-function changes their signs depending on the number of light quark flavors. Based on this, it was suggested that long and/or short distance behavior of QCD may change with the number of light quark flavors [1]. Although these arguments are founded upon perturbation theory, they may remain valid even in the non-perturbative regime. Indeed, lattice simulations with multi-flavored QCD reveal rich phase structures[2–4]. For eight light staggered quark flavors, there is a strong first order phase transition which separates the strong coupling region from the weak coupling region. For a given lattice spatial volume, this transition appears to be Ntindependent bulk transition where Nt is the number of sites along the time direction. The weak coupling phase is divided into two region : in one region of weak coupling space chiral condensates shows linear behavior in quark mass, and in the other region they show non-linearity[3]. It has been speculated that there may be a normal finite temperature phase transition between these two different weak coupling phases. On the other hand, using simulation results with Wilson quark formulation in the strong coupling limit,
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متن کامل
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Several issues related to the structure of the QCD vacuum are reviewed. We concentrate mostly on results concerning instantons and center vortices.
متن کاملar X iv : h ep - l at / 9 91 10 02 v 1 2 N ov 1 99 9 1 The finite temperature QCD phase transition with domain wall fermions .
Results from the Columbia lattice group study of the QCD finite temperature phase transition with dynamical domain wall fermions on 16 × 4 lattices are presented. These results include an investigation of the U(1) axial symmetry breaking above but close to the transition, the use of zero temperature calculations that set the scale at the transition and preliminary measurements close to the tran...
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تاریخ انتشار 2001