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arXiv 1012.1257hep-lathep-phnucl-th
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Taste对称性和改进交错费米子的QCD热力学

Taste symmetry and QCD thermodynamics with improved staggered fermions

Alexei Bazavov, Peter Petreczky

摘要:

交错费米子配方的味道对称性违反强烈相关的截止(晶格间距)的热力学量的依赖。在有限温度计算中,可以通过减小晶格间距和更大的时间范围,或者通过进一步改善作用,来实现晶格上更好的味道对称性。高度改进的交错夸克(HISQ)作用提供了进一步的改进,并大大减少了味道违规。本文报道了我们在HISQ/tree作用量下对2+1味QCD热力学的研究。通过系统地比较HISQ/tree、asqtad、p4和stout计算,我们量化了截止效应如何在不同的热力学量中表现出来,包括重整化Polyakov环、手性凝聚、各种波动和守恒电荷的相关性。状态方程的影响和强子共振气体模型的比较进行了讨论。有限温度跃迁的手征方面在伴随的HotQCD贡献[1]中讨论。

英文摘要:

Taste symmetry violations in staggered fermion formulations correlate strongly with the cut-off (lattice spacing) dependence in thermodynamic quantities. Better taste symmetry on the lattice can be achieved either by decreasing the lattice spacing and going to larger temporal extent in finite-temperature calculations, or by further improving the action. The highly improved staggered quark (HISQ) action offers a further degree of improvement and substantially reduces taste violations. We report on our studies of the 2+1 flavor QCD thermodynamics with the HISQ/tree action. By systematically comparing HISQ/tree, asqtad, p4 and stout calculations we quantify how the cut-off effects manifest themselves in different thermodynamic quantities, including the renormalized Polyakov loop, chiral condensate, various fluctuations and correlations of conserved charges. The implications for the equation of state and a comparison to the hadron resonance gas model are also discussed. The chiral aspects of the finite-temperature transition are discussed in the companion HotQCD contribution [1].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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