A new model for cosmic strings (i.e. conical singularities) attached to black holes is proposed. These string are obtained by a explicit construction via limiting process from the so – called Bonnor rocket. This reveals quite surprising nature of their stress – energy tensor which contains first derivative of Dirac δ distribution. Starting from the Bonnor rocket we explicitly construct the Schwarzschild solution witch conical singularity and the C –metric. In the latter case we show that there is a momentum flux through the cosmic string, causing the acceleration of the black hole and the amount of this momentum is in agreement with the momentum taken away by gravitational radiation.

中文翻译：

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关于黑洞时空中宇宙弦的性质

提出了一种新的宇宙弦模型（即锥形奇点）与黑洞相连。这些字符串是通过显式构造通过限制过程从所谓的 Bonnor 火箭获得的。这揭示了它们的应力——包含狄拉克 δ 分布的一阶导数的能量张量的相当惊人的性质。从 Bonnor 火箭开始，我们明确地构造了 Schwarzschild 解巫锥奇点和 C 度量。在后一种情况下，我们表明存在通过宇宙弦的动量通量，导致黑洞加速，并且该动量的大小与引力辐射带走的动量一致。