arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.08616hep-th
收藏

Melonic CFTs

Melonic CFTs

Dario Benedetti

摘要:

Melonic极限是一种相对较新类型的大$N$极限,不同于向量和矩阵场论的更古老和众所周知的大$N$极限,它们分别由仙人掌图和平面费曼图控制。Melonic极限通常出现在张量场论中,其特征在于不变性群,其中场变换为$r$不同简单李群的$r\geq 3$基本表示的乘积。顾名思义,在这样的极限中,自由能和微扰子的微扰膨胀由美仑图控制。后者形成了一个可管理的子集的平面图,但具有更丰富的结构比仙人掌图,因此,他们打开的可能性,研究控制方式的新类型的不动点的重整化群。我们称那些在内模极限中发现的不动点理论为\emph{melonic conformal field theories (CFTs)}。我们简要地回顾了$d\geq 2$(欧几里德)时空维张量场论的构造和分析,特别强调了一般的理论框架,以及某些模型的不动点的具体结果。

英文摘要:

The melonic limit is a relatively new type of large-$N$ limit, differing from the much older and well-known large-$N$ limits of vector and matrix field theories, which are dominated by cactus and planar Feynman diagrams, respectively. The melonic limit typically appears in tensor field theories, characterized by an invariance group in which the fields transform as the product of $r\geq 3$ fundamental representations of $r$ different simple Lie groups. As the name suggests, in such a limit the perturbative expansion of free energy and correlators are dominated by melonic diagrams. The latter form a manageable subset of the planar diagrams, but with a richer structure than cactus diagrams, and therefore they open the possibility of studying in a controlled manner new types of fixed points of the renormalization group. We call \emph{melonic conformal field theories (CFTs)} those fixed-point theories that are found in the melonic limit. We concisely review the construction and analysis of tensor field theories in $d\geq 2$ (Euclidean) spacetime dimensions, with special emphasis on the general theoretical framework, and on specific results for the fixed points of some models.

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。

↑