Dilatonic imprints on exact gravitational wave signatures
Dilatonic imprints on exact gravitational wave signatures
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精确引力波特征上的膨胀印记
DOI：
10.1103/physrevd.97.104025
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发表时间：
2018
影响因子：
5
通讯作者：
R. Mann
中科院分区：
文献类型：
--
作者：
Fiona McCarthy;D. Kubizňák;R. Mann
利用模空间近似，我们解析地计算了两个极值带电膨胀黑洞合并时发出的引力波特征。我们探索了膨胀耦合常数$a$的几个值，并发现与[Phys]中研究的爱因斯坦-麦克斯韦($a=0$)对应的值有显著的偏离。修订本D 96,061501(2017年)]。对于(低能)弦理论黑洞($a=1$)，没有合并轨道，只观察到记忆效应，而对于耦合的中间值($a=1/\Sqrt{3}$)，后期的合并签名被指数地抑制，而在没有伸缩子的情况下，多项式衰减。这样的印记表明，在黑洞合并中，有标量场和没有标量场(例如，弦理论预测的情况)的情况有明显的区别。
By employing the moduli space approximation, we analytically calculate the gravitational wave signatures emitted upon the merger of two extremally charged dilatonic black holes. We probe several values of the dilatonic coupling constant $a$, and find significant departures from the Einstein-Maxwell ($a=0$) counterpart studied in [Phys. Rev. D 96, 061501 (2017)]. For (low-energy) string theory black holes ($a=1$) there are no coalescence orbits and only a memory effect is observed, whereas for an intermediate value of the coupling ($a=1/\sqrt{3}$) the late-time merger signature becomes exponentially suppressed, compared to the polynomial decay in the $a=0$ case without a dilaton. Such an imprint shows a clear difference between the case with and without a scalar field (as, for example, predicted by string theory) in black hole mergers.