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arXiv 1104.4949hep-th
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关于非线性西格玛模型中黑洞的对称轨道

On the symmetry orbits of black holes in non-linear sigma models

Josef Lindman Hörnlund

摘要:

Breitenlohner,Maison和Gibbons不久前在一个引力和物质理论的大集合中声称,所有真正的四维渐近平坦非简并黑洞都处于Schwarzschild/Kerr黑洞的对称轨道中。他们的论点涉及减少理论上的时间一样,杀死向量场和分析所产生的三维西格玛模型的地图对称空间$G/H$。在他们的证明的结构中,他们证明了一个合适的$H$变换的存在,它总是消除四维黑洞解的电磁荷。我们表明,在这个简短的说明,这样的转换一般不存在,并讨论了一组边界条件的视界上的标量场的西格玛模型,产生黑洞的Breitenlohner,Maison和Gibbons的结果可以应用。

英文摘要:

Breitenlohner, Maison and Gibbons claimed some time ago that all bona-fide four dimensional asymptotically flat non-degenerate black holes are in a symmetry orbit of the Schwarzschild/Kerr black hole in a large set of theories of gravity and matter. Their argument involved reducing the theory on a time-like Killing vector field and analysing the resulting three dimensional sigma model of maps to a symmetric space $G/H$. In the construction of their proof, they conjectured the existence of a suitable $H$-transformation that always remove the electromagnetic charges of the four dimensional black hole solution. We show in this short note that such a transformation does not exist in general, and discuss a set of boundary conditions on the horizon for the scalar fields in the sigma model that yield black holes for which the result by Breitenlohner, Maison and Gibbons can be applied.

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