Traffic Noise and the Hyperbolic Plane

Details Traffic Noise and the Hyperbolic Plane Traffic Noise and the Hyperbolic Plane

2009-11-10

arxiv.org/abs/0911.1926v3

Annals Phys.325:909-923,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Typos corrected

Scientific paper

10.1016/j.aop.2009.12.007

We consider the problem of sound propagation in a wind. We note that the rays, as in the absence of a wind, are given by Fermat's principle and show how to map them to the trajectories of a charged particle moving in a magnetic field on a curved space. For the specific case of sound propagating in a stratified atmosphere with a small wind speed we show that the corresponding particle moves in a constant magnetic field on the hyperbolic plane. In this way we give a simple `straightedge and compass' method to estimate the intensity of sound upwind and downwind. We construct Mach envelopes for moving sources. Finally, we relate the problem to that of finding null geodesics in a squashed anti-de Sitter spacetime and discuss the $SO(3,1)\times \mathbb{R}$ symmetry of the problem from this point of view.

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