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arXiv 0906.3538hep-lathep-phhep-th
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具有伴随费米子的大N QCD的非微扰体积约化

Non-perturbative volume-reduction of large-N QCD with adjoint fermions

Barak Bringoltz, Stephen R. Sharpe

摘要:

我们利用非微扰格点方法研究了具有单个伴随Dirac费米子的四维大N量子色动力学的体积约化“Eguchi-Kawai”模型。我们探索了这个单点理论在夸克质量和规范耦合的空间中的相图,使用威尔逊费米子的颜色在8 <= N <= 15的范围内。我们的证据表明,N的这些值足够大,可以确定N->oo的相图的性质。我们确定了参数空间中(Z_N)^4中心对称性保持不变的区域。根据以前的理论工作,使用轨道折叠范式,并假设平移不变性在无限体积理论中不会自发地被打破,在这个区域中,体积减少成立:当N->oo时,单位点和无限体积理论变得等价。我们发现强有力的证据表明,该区域包括轻和重夸克(质量在截止尺度),我们的结果是一致的,该区域向连续极限延伸。我们还比较了重叠狄拉克算符在基本表象中的作用量密度和本征值密度与在大N纯规范理论中得到的结果。

英文摘要:

We use nonperturbative lattice techniques to study the volume-reduced "Eguchi-Kawai" version of four-dimensional large-N QCD with a single adjoint Dirac fermion. We explore the phase diagram of this single-site theory in the space of quark mass and gauge coupling using Wilson fermions for a number of colors in the range 8 <= N <= 15. Our evidence suggests that these values of N are large enough to determine the nature of the phase diagram for N-->oo. We identify the region in the parameter space where the (Z_N)^4 center-symmetry is intact. According to previous theoretical work using the orbifolding paradigm, and assuming that translation invariance is not spontaneously broken in the infinite-volume theory, in this region volume reduction holds: the single-site and infinite-volume theories become equivalent when N-->oo. We find strong evidence that this region includes both light and heavy quarks (with masses that are at the cutoff scale), and our results are consistent with this region extending towards the continuum limit. We also compare the action density and the eigenvalue density of the overlap Dirac operator in the fundamental representation with those obtained in large-N pure-gauge theory.

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