论文标题

Braneworld虫洞的回声

Echoes from braneworld wormholes

论文作者

Biswas, Shauvik, Rahman, Mostafizur, Chakraborty, Sumanta

论文摘要

在较高的空间时,我们已经研究了无质量标量,电磁和轴向重力扰动的虫洞几何形状的稳定性。有趣的是,在存在较高维度(称为braneworld虫洞的存在)的情况下构建虫洞时空,\ emph {do not}需要存在异国的物质领域,这与四个时段的场景尺寸不同。作为一个非vacuum时空,轴向重力扰动所经历的有效潜力与涉及黑洞的场景有很大不同。特别是,目前的工作提供了研究虫洞空间的重力扰动的首次尝试。我们的分析涉及分析技术和数值技术,表明所有扰动的时域信号中都有回声,而回声时间延迟与源自较高维度的参数密切相关。从而结合了寻找虫洞和额外尺寸的尝试,并存在引力波的存在。还讨论了含义和未来的方向。

We have studied the stability of wormhole geometries, under massless scalar, electromagnetic and axial gravitational perturbations, in the context of higher dimensional spacetimes. Intriguingly, the construction of a wormhole spacetime in the presence of higher dimensions, known as braneworld wormholes, \emph{does not} require the existence of exotic matter fields, unlike the scenario in four spacetime dimensions. Being a nonvacuum spacetime, the effective potential experienced by the axial gravitational perturbation differs considerably from the scenarios involving black holes. In particular, the present work provides one of the first attempts to study the gravitational perturbations of the wormhole spacetimes. Our analysis, involving both analytical and numerical techniques, demonstrates that there are echoes in the time domain signal of all the perturbations and the echo time delay is intimately related to the parameters originating from higher dimensions. Thereby combining the attempt to search for wormholes and extra dimensions, with the existence of gravitational wave echoes. Implications and future directions have also been discussed.

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