Developments in 2D String Theory
Developments in 2D String Theory
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二维弦理论的发展
DOI：
10.1142/9789814447072_0004
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
A. Jevicki
中科院分区：
文献类型：
--
作者：
A. Jevicki
近年来，二维弦理论和量子引力取得了显着进展。从矩阵模型开始，人们发现了一种新的、计算能力强大的理论描述，没有数学复杂性。这些模型与弦理论的相关性来自于 1/N 展开，其中 1/N 扮演裸弦耦合常数 g0 st = 1/N 的角色。这根据拓扑结构对费曼图进行分类；对于固定拓扑，对偶图中所有图的总和变为三角曲面的总和。然后通过将晶格间距值发送为零来接近连续统理论。
Recent years have witnessed a remarkable progress in 2d string theory and quantum gravity. Beginning with matrix models one found a new and computationally powerful description of the theory, free of mathematical complexities. The relevance of these models to string theory comes through a 1/N expansion where 1/N plays the role of a bare string coupling constant g0 st = 1/N . This classifies Feynman diagrams according to their topology; for a fixed topology the sum of all graphs in a dual picture becomes a sum of triangulated surfaces. The continuum theory is then approached by sending the value of lattice spacing to zero.