arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.4997hep-thgr-qc
收藏

一种可重正化的四维张量场论

A Renormalizable 4-Dimensional Tensor Field Theory

Joseph Ben Geloun, Vincent Rivasseau

摘要:

我们证明了在$U(1)^4$上补充通常的玻色传播子的Gurau色张量模型的集成版本在微扰理论中是可重整化到所有阶的。该模型是4D欧氏引力中时空量子化所期望的类型,并且是这种可重正化模型的第一个例子。它的顶点和传播子是四股的,就像在四维群场论中一样,但是没有在股上进行规范平均。也许令人惊讶的是,该模型是$ϕ^6$型而不是$ϕ^4$型,因为两种不同的$ϕ^6$型相互作用是对数发散的,即在重整化群意义上是边缘的。重整化的证明依赖于多尺度分析。它通过一个幂计数定理确定所有发散图。这些发散图具有一种特殊类型的内部和外部结构,称为甜瓜结构。Melonic图控制了着色张量模型的1/N展开,推广了矩阵模型的平面带状图。一个新的局部性原则是建立这一类的图形,它允许通过裸拉格朗日相互作用的形式的counterterms重新正规化他们的分歧。该模型也有一个意想不到的异常对数发散$(\int ϕ^2)^2$项,这可以解释为纯引力产生的标量物质场。

英文摘要:

We prove that an integrated version of the Gurau colored tensor model supplemented with the usual Bosonic propagator on $U(1)^4$ is renormalizable to all orders in perturbation theory. The model is of the type expected for quantization of space-time in 4D Euclidean gravity and is the first example of a renormalizable model of this kind. Its vertex and propagator are four-stranded like in 4D group field theories, but without gauge averaging on the strands. Surprisingly perhaps, the model is of the $ϕ^6$ rather than of the $ϕ^4$ type, since two different $ϕ^6$-type interactions are log-divergent, i.e. marginal in the renormalization group sense. The renormalization proof relies on a multiscale analysis. It identifies all divergent graphs through a power counting theorem. These divergent graphs have internal and external structure of a particular kind called melonic. Melonic graphs dominate the 1/N expansion of colored tensor models and generalize the planar ribbon graphs of matrix models. A new locality principle is established for this category of graphs which allows to renormalize their divergences through counterterms of the form of the bare Lagrangian interactions. The model also has an unexpected anomalous log-divergent $(\int ϕ^2)^2$ term, which can be interpreted as the generation of a scalar matter field out of pure gravity.

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。

↑