ON COSMOLOGICAL STRING BACKGROUNDS WITH TOROIDAL ISOMETRIES

被引：28

作者：

GIVEON, A

PASQUINUCCI, A

机构：

[1] INST ADV STUDY,SCH NAT SCI,PRINCETON,NJ 08540

[2] PRINCETON UNIV,GUGGENHEIM LABS,DEPT PHYS,PRINCETON,NJ 08544

来源：

PHYSICS LETTERS B | 1992年 / 294卷 / 02期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0370-2693(92)90677-V

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A large class of cosmological solutions (of the Einstein equations) in string theory, in the presence of Maxwell fields, is obtained by O(d, d) transformations of simple backgrounds with d toroidal isometries. In all examples in which we find a (closed) expanding universe, such that the universe admits a smooth, complete initial value hypersurface, a naked singularity may form only at the time when the universe collapses. The discrete symmetry group 0(d, d, Z) identifies different cosmological solutions with a background corresponding to a (relatively) simple CFT, and therefore, may be useful in understanding the properties of naked singularities in string theory.

引用

页码：162 / 166

页数：5

共 11 条

[1]

DIJKGRAAF R, 1992, NUCL PHYS B, V371, P269, DOI 10.1016/0550-3213(92)90237-6

[2] FROM TRIVIAL TO NONTRIVIAL CONFORMAL STRING BACKGROUNDS VIA O (D, D) TRANSFORMATIONS [J].