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arXiv 0904.0466hep-phnucl-th
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泛函重整化群与O(4)标度

The Functional Renormalization Group and O(4) scaling

B. Stokic, B. Friman, K. Redlich

摘要:

在泛函重整化群(FRG)中研究了手征夸克-介子模型的临界行为。在有限温度和有限密度下,我们导出了在有破缺外场存在下的尺度相关热力学势的流动方程。在此方案下,计算了序参量的临界标度行为、横向和纵向的非线性以及手征相变附近的关联长度。我们着重讨论了这些观测量在外场非零情况下从对称相位和从破缺相位接近临界点时的标度性质。我们面对我们的数值结果与Widom-Griffiths形式的磁状态方程,通过系统的ε-扩展的标度函数。临界指数的计算结果与最近在O(4)自旋系统的格子Monte-Carlo研究中计算的结果一致。

英文摘要:

The critical behavior of the chiral quark-meson model is studied within the Functional Renormalization Group (FRG). We derive the flow equation for the scale dependent thermodynamic potential at finite temperature and density in the presence of a symmetry-breaking external field. Within this scheme, the critical scaling behavior of the order parameter, its transverse and longitudinal susceptibilities as well as the correlation lengths near the chiral phase transition are computed. We focus on the scaling properties of these observables at non-vanishing external field when approaching the critical point from the symmetric as well as from the broken phase. We confront our numerical results with the Widom-Griffiths form of the magnetic equation of state, obtained by a systematic epsilon-expansion of the scaling function. Our results for the critical exponents are consistent with those recently computed within Lattice Monte-Carlo studies of the O(4) spin system.

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