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arXiv 0907.3969hep-thgr-qchep-ph
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从CFT导出的可重整化四维量子引力的微扰理论

Renormalizable 4D Quantum Gravity as A Perturbed Theory from CFT

Ken-ji Hamada

摘要:

在四维共形引力的基础上,研究了由共形场论(CFT)导出的微扰理论形式的可重整化量子引力。度规场中的共形模被非微扰地管理,而不引入其自身的耦合常数,使得共形对称性成为精确的量子力学的一部分,作为共形不变性。无痕张量模式处理的扰动与无量纲的耦合常数,表示渐近自由,它的措施从CFT的偏差程度。没有大质量鬼,因为在这个公式中它们不是规范不变的。利用维数正则化方法进行高阶重整化,其中应用Wess-Zumino可积性条件减少高阶导数作用量中存在的不确定性。得到了用重整化群改进的量子引力的有效作用量。然后,我们清楚地表明,共形异常是必不可少的量,以保持同胚不变性。计算了宇宙学常数和普朗克质量的反常标度维数。在物质场的大数极限下得到了有效宇宙学常数。

英文摘要:

We study the renormalizable quantum gravity formulated as a perturbed theory from conformal field theory (CFT) on the basis of conformal gravity in four dimensions. The conformal mode in the metric field is managed non-perturbatively without introducing its own coupling constant so that conformal symmetry becomes exact quantum mechanically as a part of diffeomorphism invariance. The traceless tensor mode is handled in the perturbation with a dimensionless coupling constant indicating asymptotic freedom, which measures a degree of deviation from CFT. There are no massive ghosts because they are not gauge invariant in this formulation. Higher order renormalization is carried out using dimensional regularization, in which the Wess-Zumino integrability condition is applied to reduce indefiniteness existing in higher-derivative actions. The effective action of quantum gravity improved by renormalization group is obtained. We then make clear that conformal anomalies are indispensable quantities to preserve diffeomorphism invariance. Anomalous scaling dimensions of the cosmological constant and the Planck mass are calculated. The effective cosmological constant is obtained in the large number limit of matter fields.

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