正则声孔对声波的散射
Scattering of Sound Waves by a Canonical Acoustic Hole
摘要：
本文研究单色平面微扰对正则声孔的作用。我们表明，声学孔散射与黑洞散射的关键特征。在孔周围以相反方向通过的波前的干涉在散射强度中产生规则的振荡。我们研究这种影响，通过应用分波法计算的微分散射截面的入射波长范围。我们证明了存在一个散射峰在向后的方向，称为荣耀。我们表明，由正则声孔创造的荣耀是约170倍，比史瓦西黑洞创造的荣耀，等效的地平线波长比。我们希望在不久的将来能够对这种效应进行直接的实验观察。
英文摘要：
This is a study of a monochromatic planar perturbation impinging upon a canonical acoustic hole. We show that acoustic hole scattering shares key features with black hole scattering. The interference of wavefronts passing in opposite senses around the hole creates regular oscillations in the scattered intensity. We examine this effect by applying a partial wave method to compute the differential scattering cross section for a range of incident wavelengths. We demonstrate the existence of a scattering peak in the backward direction, known as the glory. We show that the glory created by the canonical acoustic hole is approximately 170 times less intense than the glory created by the Schwarzschild black hole, for equivalent horizon-to-wavelength ratios. We hope that direct experimental observations of such effects may be possible in the near future.
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