We review the blackfold description of the fully localized orthogonal M2-M5 intersection in eleven-dimensional supergravity which constitutes the direct gravitational analogue of the Howe-Lambert-West self-dual string soliton solution. We emphasize the preliminary implications of this description for the physics of the M2-M5 system and the novel research directions that it opens. This report contains several new results. As an extension of previous work we report new results on deformations of the M2-M5-KKW intersection that describe self-dual ring intersections. Extremal non-supersymmetric configurations of this type probe novel aspects of the M2-M5 system and allow us to explore further the merits and limitations of the blackfold description of black brane intersections. In particular, we provide an example of a situation where an effective description of extremal non-supersymmetric spike configurations is shown to capture correctly features of the exact solutions beyond its strict regime of validity. This observation hints at the existence of improved convergence properties in the underlying derivative expansion scheme without the necessary presence of supersymmetry.
The Phase Structure of Higher-Dimensional Black Rings and Black Holes
我们构造了一个渐近平坦的，中性的，薄的旋转黑环在任何维度D>=5的近似解，通过匹配的近地平线的解决方案，一个弯曲的助推黑弦，远离地平线的线性化的重力解决方案。旋转黑环解具有拓扑结构为S ^1 x S^{D-3}的正则视界，并将环的平衡条件作为零张力条件。对于D=5，我们的方法重现了薄环极限的确切的黑环解决方案。当D>=6时，我们证明了在超自旋状态下，黑环比Myers-Perry黑洞有更高的熵.通过利用超自旋黑洞和两个环面上的黑膜之间的对应关系，我们采取步骤，定性地完成具有单一角动量的旋转黑洞的相图。我们提出了一个MP黑洞和黑环之间的连接，MP黑洞和黑色土星之间，通过合并过渡涉及两种“捏”黑洞。更一般地说，这个类比暗示了无限多个球形拓扑的收缩黑洞，导致了相之间复杂的连接和合并模式。
