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arXiv 1111.1059hep-lat
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两个伴随Dirac费米子的大N约化

Large-N reduction with two adjoint Dirac fermions

Barak Bringoltz, Mateusz Koren, Stephen R. Sharpe

摘要:

本文研究了单格点SU(N)格点规范理论,N_f=2,伴随Wilson费米子,N ≤ 53。我们将理论的相图确定为跳跃参数kappa和t胡夫特耦合b的倒数的函数,寻找Z_N^4中心对称性未破缺的区域。在这个区域,当N趋于无穷大时,理论等价于无限体积理论。我们在kappa_c的两侧发现了一个对称性未破缺的kappa值区域,其中既有轻物理夸克,又有质量~O(1/a)的夸克。这是由一个复杂的序列的部分破碎相的区域包围。我们计算了威尔逊圈的期望值,发现当N <= 53时,可以在小距离(1-3个环)上提取重夸克势,但在更长的距离上不能。为此,需要更大的N值或具有更多站点的晶格。

英文摘要:

We study the single site SU(N) lattice gauge theory with N_f=2 adjoint Wilson fermions for values of N up to 53. We determine the phase diagram of the theory as a function of the hopping parameter kappa and the inverse 't Hooft coupling b, searching for the region in which the Z_N^4 center symmetry is unbroken. In this region the theory is equivalent to the infinite volume theory when N goes to infinity. We find a region of values of kappa on both sides of kappa_c for which the symmetry is unbroken, including both light physical quarks and masses ~O(1/a). This is surrounded by a region with a complicated sequence of partially broken phases. We calculate Wilson loop expectation values and find that using N <= 53 it is possible to extract the heavy-quark potential at small distances (1-3 links) but not at longer distances. For this, larger values of N, or lattices with more sites, are needed.

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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