Within effective heterotic superstring theory compactified on a six-torus we derive minimum energy (supersymmetric), static, spherically symmetric solutions, which are manifestly invariant under the target space O(6,22) and the strong-weak coupling SL(2,I\!\!R) duality symmetries with 28 electric and 28 magnetic charges subject to one constraint. The class of solutions with a constant axion corresponds to dyonic configurations subject to two charge constraints, with purely electric [or purely magnetic] and dyonic configurations preserving {1\over 2} and {1\over 4} of N=4 supersymmetry, respectively. General dyonic configurations in this class have a space-time of extreme Reissner-Nordstr\" om black holes while configurations with more constrained charges have a null or a naked singularity.
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机译：在六阶压缩的有效异质超弦理论中，我们得出最小能量（超对称），静态，球对称解决方案，它们在目标空间O（6,22）和强弱耦合SL（2，I）下明显不变R）具有28个电荷和28个磁电荷的对偶对称性，受一个约束。具有恒定轴力的解的类别对应于受两个电荷约束的重音构型，其中纯电[或纯磁]和重音构型分别保留N = 4超对称的{1 \ over 2}和{1 \ over 4}。 。此类中的一般重音结构具有极大的Reissner-Nordstr“黑洞时空，而电荷受更多约束的结构则具有零或裸奇点。
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