Excised acoustic black holes: the scattering problem in the time domain
Excised acoustic black holes: the scattering problem in the time domain
复制标题
切除的声学黑洞：时域中的散射问题
DOI：
10.1103/physrevd.72.084016
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发表时间：
2005
影响因子：
5
通讯作者：
M. Tosi
中科院分区：
文献类型：
--
作者：
C. Cherubini;F. Federici;S. Succi;M. Tosi
在时域中对冲击声学黑洞排水桶模型的动态扰动的散射过程进行了数值求解。通过使用最近开发的数学工具，包括有限元方法、切除技术和强双曲系统的约束演化方案，探索了与广义相对论中真实黑洞的类比。特别是，它表明准单色波包的超辐射散射可以产生信号的强烈放大，从而提供了在涡旋角频率和波包中心频率的适当值下显着提取旋转能量的可能性。结果表明，最近开发的引力波理论工具可以在研究存在强各向异性的其他问题中取得成果。
The scattering process of a dynamic perturbation impinging on a draining-tub model of an acoustic black hole is numerically solved in the time domain. Analogies with real black holes of General Relativity are explored by using recently developed mathematical tools involving finite elements methods, excision techniques, and constrained evolution schemes for strongly hyperbolic systems. In particular it is shown that superradiant scattering of a quasi-monochromatic wavepacket can produce strong amplification of the signal, offering the possibility of a significant extraction of rotational energy at suitable values of the angular frequency of the vortex and of the central frequency of the wavepacket. The results show that theoretical tools recently developed for gravitational waves can be brought to fruition in the study of other problems in which strong anisotropies are present.