Scattering of Sound Waves by a Canonical Acoustic Hole

Details Scattering of Sound Waves by a Canonical Acoustic Hole Scattering of Sound Waves by a Canonical Acoustic Hole

2009-03-31

arxiv.org/abs/0904.0010v2

Phys.Rev.D79:064014,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, 7 figures

Scientific paper

10.1103/PhysRevD.79.064014

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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