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arXiv 0905.3609hep-ph
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具有Polyakov圈贡献的瞬子的有效热力学势

An effective thermodynamic potential from the instanton with Polyakov-loop contributions

Seung-il Nam

摘要:

在手征极限下,利用奇规范瞬子解和松原公式,在N_c=3,N_f=2的情况下,导出了有限温度(T>0)和零夸克化学势(μ_R=0)下的有效热力学势(Omega_eff).利用大N_c极限下的Harrington-Shepard介子解,得到了动量相关的组分夸克质量随T的变化关系。此外,我们还考虑了虚夸克化学势μ_I = A_4,即作为Z(N_c)对称性的序参量的示踪Polayakov圈(Phi),表征了禁闭(完整)和解除禁闭(自发破缺)相.结果,我们观察到手性(chi)序参量σ ^2和Φ的交叉。与组分夸克质量不变的情况相比,退补相变的临界温度T^Z_c降低了约(5-10)%.这种行为可以通过部分手征恢复和非平凡QCD真空对Φ的显著影响来理解。数值计算表明,交叉跃迁发生在(T^chi_c,T^Z_c)~(216,227)MeV处.

英文摘要:

We derive an effective thermodynamic potential (Omega_eff) at finite temperature (T>0) and zero quark-chemical potential (mu_R=0), using the singular-gauge instanton solution and Matsubara formula for N_c=3 and N_f=2 in the chiral limit. The momentum-dependent constituent-quark mass is also obtained as a function of T, employing the Harrington-Shepard caloron solution in the large-N_c limit. In addition, we take into account the imaginary quark chemical potential mu_I = A_4, translated as the traced Polayakov-loop (Phi) as an order parameter for the Z(N_c) symmsetry, characterizing the confinement (intact) and deconfinement (spontaneously broken) phases. As a result, we observe the crossover of the chiral (chi) order parameter sigma^2 and Phi. It also turns out that the critical temperature for the deconfinment phase transition, T^Z_c is lowered by about (5-10)% in comparison to the case with a constant constituent-quark mass. This behavior can be understood by considerable effects from the partial chiral restoration and nontrivial QCD vacuum on Phi. Numerical calculations show that the crossover transitions occur at (T^chi_c,T^Z_c) ~ (216,227) MeV.

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