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arXiv 1905.07576hep-thgr-qc
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电磁黑洞的全息复杂性

Holographic complexity of the electromagnetic black hole

Jie Jiang, Ming Zhang

摘要:

本文利用“复杂性等于作用量”(CA)猜想,研究了F(Riemann)引力耦合一阶无源电动力学的多能级黑洞的全息复杂性.受Goto $et.\, al$关于纯磁黑洞的消失结果的启发,我们研究了具有无源电动力学的静态荷电黑洞的复杂性,发现这种晚时速率的消失特征对于纯磁静态黑洞是普遍的.然而,这一结果显示了后期增长率的一些意想不到的特征。我们展示了如何包含一阶电磁场的总作用的边界项可以使全息复杂性被很好地定义,并获得了这些边界项的后期复杂性增长率的一般表达式。我们将我们的后期结果应用到一些明确的情况下,并展示了如何选择这些额外的边界项的比例常数,使复杂性被定义在零电荷限制。对于耦合一阶电动力学的静态磁黑洞,我们发现电磁场的拉格朗日函数$h(\math{F})$与黑洞的本征比例常数之间存在着一般的关系:如果$h(\math{F})$是收敛函数,则比例常数的选取与$h(\math{F})$的显式无关,应取$4/3$ ;如果$h(\math{F})$是发散函数,则比例常数取决于拉格朗日函数的渐近指数。

英文摘要:

In this paper, we use the "complexity equals action" (CA) conjecture to evaluate the holographic complexity in some multiple-horzion black holes for F(Riemann) gravity coupled to a first-order source-free electrodynamics. Motivated by the vanishing result of the purely magnetic black hole founded by Goto $et.\, al$, we investigate the complexity in a static charged black hole with source-free electrodynamics and find that this vanishing feature of the late-time rate is universal for a purely static magnetic black hole. However, this result shows some unexpected features of the late-time growth rate. We show how the inclusion of a boundary term for the first-order electromagnetic field to the total action can make the holographic complexity be well-defined and obtain a general expression of the late-time complexity growth rate with these boundary terms. We apply our late-time result to some explicit cases and show how to choose the proportional constant of these additional boundary terms to make the complexity be well-defined in the zero-charge limit. For the static magnetic black hole in Einstein gravity coupled to a first-order electrodynamics, we find that there is a general relationship between the proper proportional constant and the Lagrangian function $h(\math{F})$ of the electromagnetic field: if $h(\math{F})$ is a convergent function, the choice of the proportional constant is independent on explicit expressions of $h(\math{F})$ and it should be chosen as $4/3$; if $h(\math{F})$ is a divergent function, the proportional constant is dependent on the asymptotic index of the Lagrangian function.

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