Renormalization group flow of SU(3) lattice gauge theory : Numerical studies in a two coupling space

Renormalization group flow of SU(3) lattice gauge theory : Numerical studies in a two coupling space
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SU(3) 晶格规范理论的重正化群流:二元耦合空间中的数值研究

DOI:
10.1016/s0550-3213(00)00145-0
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发表时间:
1999
期刊:
Nuclear Physics
影响因子:
--
通讯作者:
T. Umeda
T. Umeda
中科院分区:
--
文献类型:
--
作者:
P. Forcrand;M. G. Pérez;T. Hashimoto;S. Hioki;H. Matsufuru;O. Miyamura;A. Nakamura;I. Stamatescu;I. Stamatescu;T. Takaishi;T. Umeda

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研究了双耦合空间中SU(3)格点规范理论的重整化群流,其中耦合β 11和β 12分别对应于1×1和1×2圈.在该耦合空间的第四象限中进行了RG流的大量数值计算,即,β11>0且β12<0。利用Swendsen的因子二阻塞和Schwinger-Dyson方法,对阻塞规范场寻找有效的作用量。由此产生的重正化群流快速地流向具有近似线形的吸引流。这是一个位于两个耦合空间附近的重整化轨道的数值证据。一个模型流方程,其中包括一个边际耦合(渐近标度项),一个无关的耦合和非微扰吸引力对强耦合限制定性重现所观察到的功能。我们进一步研究的缩放属性的一个动作,这是更接近的吸引力流比目前使用的改进的行动。据发现,这一行动表现出良好的恢复旋转对称性,即使是粗糙的晶格与一个0.3 FM。
We investigate the renormalization group (RG) flow of SU(3) lattice gauge theory in a two coupling space with couplings β11and β12corresponding to 1×1 and 1×2 loops, respectively. Extensive numerical calculations of the RG flow are made in the fourth quadrant of this coupling space, i.e., β11>0 and β12<0 . Swendsen's factor two blocking and the Schwinger–Dyson method are used to find an effective action for the blocked gauge field. The resulting renormalization group flow runs quickly towards an attractive stream which has an approximate line shape. This is a numerical evidence of a renormalized trajectory which locates close to the two coupling space. A model flow equation which incorporates a marginal coupling (asymptotic scaling term), an irrelevant coupling and a non-perturbative attraction towards the strong coupling limit reproduces qualitatively the observed features. We further examine the scaling properties of an action which is closer to the attractive stream than the currently used improved actions. It is found that this action shows excellent restoration of rotational symmetry even for coarse lattices with a∼0.3 fm.
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