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arXiv 0806.0605hep-th
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M理论中的精确半BPS通量解I,局部解

Exact Half-BPS Flux Solutions in M-theory I, Local Solutions

Eric D'Hoker, John Estes, Michael Gutperle, Darya Krym

摘要:

本文得到了具有$AdS_3 \times S^3 \times S^3 \times Σ$形式的流形上的16个超对称、具有等距$SO(2,2) \times SO(4) \times SO(4)$、具有$AdS_4 \times S^7$或$AdS_7 \times S^4$边界行为的11维超引力完整解的精确形式。二维参数空间$Σ$是一个带边界的黎曼曲面,乘积空间$AdS_3 \times S^3 \times S^3$在该曲面上翘曲。通过将约化的BPS方程映射到sine-Gordon/Liouville型可积系统上,再将该可积系统映射到线性方程上,利用$Σ$上的一个调和函数和$Σ$上的两个调和函数的积分变换,构造了一般的局部解. BPS方程的解被示出为自动求解4-形式场的Bianchi恒等式和场方程以及爱因斯坦方程。我们得到的解在$AdS_3 \times S^3 \times S^3$的三个因子上都有非零的4-形式场强,并且包含了$AdS_7 \times S^4$中完全反反应的M2-膜和$AdS_4 \times S^7$中完全反反应的M5-膜.不存在混合$AdS_4 \times S^7$和$AdS_7 \times S^4$边界行为的插值解。这些局部解的整体正则性,以及既不具有$AdS_4 \times S^7$也不具有$AdS_7 \times S^4$边界行为的进一步解的存在性将在其他地方研究。

英文摘要:

The complete eleven-dimensional supergravity solutions with 16 supersymmetries on manifolds of the form $AdS_3 \times S^3 \times S^3 \times Σ$, with isometry $SO(2,2) \times SO(4) \times SO(4)$, and with either $AdS_4 \times S^7$ or $AdS_7 \times S^4$ boundary behavior, are obtained in exact form. The two-dimensional parameter space $Σ$ is a Riemann surface with boundary, over which the product space $AdS_3 \times S^3 \times S^3$ is warped. By mapping the reduced BPS equations to an integrable system of the sine-Gordon/Liouville type, and then mapping this integrable system onto a linear equation, the general local solutions are constructed explicitly in terms of one harmonic function on $Σ$, and an integral transform of two further harmonic functions on $Σ$. The solutions to the BPS equations are shown to automatically solve the Bianchi identities and field equations for the 4-form field, as well as Einstein's equations. The solutions we obtain have non-vanishing 4-form field strength on each of the three factors of $AdS_3 \times S^3 \times S^3$, and include fully back-reacted M2-branes in $AdS_7 \times S^4$ and M5-branes in $AdS_4 \times S^7$. No interpolating solutions exist with mixed $AdS_4 \times S^7$ and $AdS_7 \times S^4$ boundary behavior. Global regularity of these local solutions, as well as the existence of further solutions with neither $AdS_4 \times S^7$ nor $AdS_7 \times S^4$ boundary behavior will be studied elsewhere.

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