SINGULAR BPS SATURATED STATES AND ENHANCED SYMMETRIES OF 4-DIMENSIONAL N=4 SUPERSYMMETRIC STRING VACUA

被引:89
作者
CVETIC, M [1 ]
YOUM, D [1 ]
机构
[1] UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106
关键词
D O I
10.1016/0370-2693(95)01092-5
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A class of supersymmetric (BPS saturated), static, spherically symmetric solutions of four-dimensional effective N = 4 supersymmetric superstring vacua, which become massless at special points of moduli space, is studied in terms of the fields of the effective heterotic string theory compactified on a six-torus. Those are singular four-dimensional solutions corresponding to 0(6, 22, Z) orbits of dyonic configurations (with zero axion), whose left-moving as well as right-moving electric and magnetic charges are orthogonal (light-like in the 0(6,22, Z) sense), while the 0(6,22, Z) norms of both the electric and magnetic charges are negative. Purely electric [or purely magnetic] and dyonic configurations preserve 1/2 and 1/4 of N = 4 supersymmetry, respectively, thus belonging to the vector and the highest spin 3/2 supermultiplets, respectively. Purely electric [or purely magnetic] solutions (along with an infinite tower of SL(2, Z) transformed states) become massless at a point of the corresponding ''one-torus'', thus may contribute to the enhancement of non-Abelian gauge symmetry, while dyonic solutions become simultaneously massless at a point of the corresponding two-torus, and thus may in addition contribute to the enhancement of the local supersymmetry there.
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页码:87 / 92
页数:6
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