TOPOLOGICAL STRINGS, FLAT COORDINATES AND GRAVITATIONAL DESCENDANTS

被引:46
作者
EGUCHI, T
KANNO, H
YAMADA, Y
YANG, SK
机构
[1] UNIV CAMBRIDGE,DAMTP,CAMBRIDGE CB3 9EW,ENGLAND
[2] KEK,TSUKUBA,IBARAKI 305,JAPAN
[3] UNIV TSUKUBA,INST PHYS,TSUKUBA,IBARAKI 305,JAPAN
关键词
D O I
10.1016/0370-2693(93)90113-V
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We discuss physical spectra and correlation functions of topological minimal models coupled to topological gravity. We first study the BRST formalism of these theories and show that their BRST operator Q = Q(s) + Q(v) can be brought to Q(s) by a certain homotopy operator U, UQU-1 = Q(s) (Q(s) and Q(v) are the N = 2 and diffeomorphism BRST operators, respectively). The reparametrization (anti)-ghost b mixes with the supercharge operator G under this transformation. The existence of this transformation enables us to use matter fields to represent cohomology classes of the operator Q. We explicitly construct gravitational descendants and show that they generate the higher-order KdV flows. We also evaluate genus-zero correlation functions and rederive basic recursion relations of two-dimensional topological gravity.
引用
收藏
页码:235 / 241
页数:7
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