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arXiv 1301.2879hep-lathep-phhep-th
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用Dirac模展开研究禁闭和手征对称性破缺

Lattice QCD study of confinement and chiral symmetry breaking with Dirac-mode expansion

Hideo Suganuma, Shinya Gongyo, Takumi Iritani

摘要:

利用QCD Dirac算符$\Slash D=γ^μD^μ$的本征模,我们发展了QCD算符如威尔逊圈和Polyakov环的一个明显的规范协变展开和投影.利用这种方法,我们在格点量子色动力学蒙特卡罗计算中直接分析了禁闭与手征对称性破缺之间的相关性。即使去掉导致手征对称性破缺的低阶Dirac模,我们也发现威尔逊圈服从面积定律,弦的张力和约束力几乎不变.我们还发现,即使没有低阶Dirac模,Polyakov环仍然几乎为零,这表明存在Z_3-不间断的禁闭相。这些结果表明,量子色动力学中的禁闭与手征对称性破缺之间并不存在一一对应的关系。

英文摘要:

Using the eigen-mode of the QCD Dirac operator $\Slash D=γ^μD^μ$, we develop a manifestly gauge-covariant expansion and projection of the QCD operators such as the Wilson loop and the Polyakov loop. With this method, we perform a direct analysis of the correlation between confinement and chiral symmetry breaking in lattice QCD Monte Carlo calculations. Even after removing the low-lying Dirac modes, which are responsible to chiral symmetry breaking, we find that the Wilson loop obeys the area law, and the string tension or the confinement force is almost unchanged. We find also that the Polyakov loop remains to be almost zero even without the low-lying Dirac modes, which indicates the Z_3-unbroken confinement phase. These results indicate that one-to-one correspondence does not hold between confinement and chiral symmetry breaking in QCD.

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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