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arXiv 2108.04161hep-thmath-phmath.DGmath.MP
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共形紧化$\mathrm{AdS}_5$边界的色限域

Color confinement at the boundary of the conformally compactified $\mathrm{AdS}_5$

M. Kirchbach, T. Popov, J. A. Vallejo

摘要:

闭流形的拓扑结构迫使相互作用的电荷成对出现。利用这一性质,我们在拓扑等价于闭流形$S^1\times S^3$的$\mathrm{AdS}_5$的共形边界上,通过考虑两个无质量的相反电荷的耦合,把相互作用势作为库仑相互作用的模拟(从$S^3$ Laplace-Beltrami算子的基本解导出),提出了共形$S^1\times S^3$度量变形,使得在存在相互作用势的情况下,变形度量上的自由运动等效于舍入度量上的运动。我们给出了度量变形诱导的表示中的共形代数的生成元的显式表达式。通过将电荷定义为QCD中的色自由度,将双电荷系统定义为夸克-反夸克系统,我们认为相应的共形波算符方程可以对最简单的QCD系统--介子提供一个现实的量子力学描述。最后,我们讨论的可能性,采用紧化半径,$R$,作为另一个尺度沿$Λ_{QCD}$,通过它,在重新参数化$Q^2c^2$为$\left( Q^2c^2 +\hbar^2 c^2/R^2\right)$,在红外过程的微扰处理可以接近。

英文摘要:

The topology of closed manifolds forces interacting charges to appear in pairs. We take advantage of this property in the setting of the conformal boundary of $\mathrm{AdS}_5$ spacetime, topologically equivalent to the closed manifold $S^1\times S^3$, by considering the coupling of two massless opposite charges on it. Taking the interaction potential as the analog of Coulomb interaction (derived from a fundamental solution of the $S^3$ Laplace-Beltrami operator), a conformal $S^1\times S^3$ metric deformation is proposed, such that free motion on the deformed metric is equivalent to motion on the round metric in the presence of the interaction potential. We give explicit expressions for the generators of the conformal algebra in the representation induced by the metric deformation. By identifying the charge as the color degree of freedom in QCD, and the two charges system as a quark--anti-quark system, we argue that the associated conformal wave operator equation could provide a realistic quantum mechanical description of the simplest QCD system, the mesons. Finally, we discuss the possibility of employing the compactification radius, $R$, as another scale along $Λ_{QCD}$, by means of which, upon reparametrizing $Q^2c^2$ as $\left( Q^2c^2 +\hbar^2 c^2/R^2\right)$, a pertubative treatment of processes in the infrared could be approached.

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