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arXiv 1605.04490hep-thgr-qcmath-phmath.MP
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广义相对论在AdS $_{3}$和KdV体系上的边界条件

Boundary conditions for General Relativity on AdS$_{3}$ and the KdV hierarchy

Alfredo Pérez, David Tempo, Ricardo Troncoso

摘要:

本文证明了在三维时空中具有负宇宙常数的广义相对论中存在一族新的边界条件,它们用一个非负整数$k$来表示.引力激发则由满足KdV体系第$k$个元素的方程的“边界引力子”来描述。特别是,$k=0$对应于布朗-亨诺边界条件,使激发描述的手征移动。在$k=1$情形下,边界引力子满足KdV方程,渐近对称代数是无限维的、阿贝尔的、无中心扩张的。后一个特征也适用于描述层次结构($k>1$)的其余情况。我们的边界条件,然后提供了一个引力对偶的两个非相互作用的左,右KdV移动,因此,边界引力子具有各向异性的Lifshitz标度与动力学指数$z=2k+1$。值得注意的是,尽管时空求解场方程是局部AdS,但它们具有由边界条件的选择引起的各向异性标度。作为一个应用,我们精确地从Cardy公式的适当推广中恢复了旋转BTZ黑洞的熵,该公式与手征KdV运动子在边界处的各向异性标度相容,其中AdS时空的能量依赖于$z$,并在边界条件下起中心电荷的作用.我们的边界条件的情况下,更高的自旋引力和它的联系与不同类别的可积系统的扩展也简要讨论。

英文摘要:

It is shown that General Relativity with negative cosmological constant in three spacetime dimensions admits a new family of boundary conditions being labeled by a nonnegative integer $k$. Gravitational excitations are then described by "boundary gravitons" that fulfill the equations of the $k$-th element of the KdV hierarchy. In particular, $k=0$ corresponds to the Brown-Henneaux boundary conditions so that excitations are described by chiral movers. In the case of $k=1$, the boundary gravitons fulfill the KdV equation and the asymptotic symmetry algebra turns out to be infinite-dimensional, abelian and devoid of central extensions. The latter feature also holds for the remaining cases that describe the hierarchy ($k>1$). Our boundary conditions then provide a gravitational dual of two noninteracting left and right KdV movers, and hence, boundary gravitons possess anisotropic Lifshitz scaling with dynamical exponent $z=2k+1$. Remarkably, despite spacetimes solving the field equations are locally AdS, they possess anisotropic scaling being induced by the choice of boundary conditions. As an application, the entropy of a rotating BTZ black hole is precisely recovered from a suitable generalization of the Cardy formula that is compatible with the anisotropic scaling of the chiral KdV movers at the boundary, in which the energy of AdS spacetime with our boundary conditions depends on $z$ and plays the role of the central charge. The extension of our boundary conditions to the case of higher spin gravity and its link with different classes of integrable systems is also briefly addressed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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