ON FIELD REDEFINITIONS AND EXACT-SOLUTIONS IN STRING THEORY

被引:30
作者
TSEYTLIN, AA [1 ]
机构
[1] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND
关键词
D O I
10.1016/0370-2693(93)91372-T
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
String backgrounds associated with gauged G/H WZNW models in general depend nontrivially on alpha'. We note, however that there exists a local covariant alpha'-dependent field redefinition that relates the exact metric-dilaton background corresponding to the SL(2, R)/U(1) model to its leading-order form (D = 2 black hole). As a consequence, there exists a ''scheme'' in which the string effective equations have the latter as an exact solution. However, the corresponding equation for the tachyon (which, like other Weyl anomaly equations, has scheme-dependent form) still contains corrections of all orders in alpha'. As a result, the string ''probes'' still feel the alpha'-corrected background. The field redefinitions we discuss contain the dilaton terms in the metric transformation law. We also comment on exact forms of the duality transformation in different ''schemes''.
引用
收藏
页码:559 / 564
页数:6
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