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2 The Simplest Example of an Analogue Model

Acoustics in a moving fluid is the simplest and cleanest example of an analogue model [376Jump To The Next Citation Point387Jump To The Next Citation Point391Jump To The Next Citation Point389Jump To The Next Citation Point]. The basic physics is simple, the conceptual framework is simple, and specific computations are often simple (whenever, that is, they are not impossibly hard).1


 2.1 Background
 2.2 Geometrical acoustics
 2.3 Physical acoustics
 2.4 General features of the acoustic metric
 2.5 Dumb holes - ergo-regions, horizons, and surface gravity
  2.5.1 Example: vortex geometry
  2.5.2 Example: slab geometry
  2.5.3 Example: Painlevé-Gullstrand geometry
 2.6 Regaining geometric acoustics
 2.7 Generalizing the physical model
  2.7.1 External forces
  2.7.2 The role of dimension
  2.7.3 Adding vorticity
 2.8 Simple Lagrangian meta-model
 2.9 Going further

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