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Figure 1:
Artistic impression of cascading sound cones (in the geometrical acoustics limit) forming an acoustic black hole when supersonic flow tips the sound cones past the vertical. |
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Figure 2:
Artistic impression of trapped waves (in the physical acoustics limit) forming an acoustic black hole when supersonic flow forces the waves to move downstream. |
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Figure 3:
A moving fluid will drag sound pulses along with it. |
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Figure 4:
A moving fluid will tip the “sound cones” as it moves. Supersonic flow will tip the sound cones past the vertical. |
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Figure 5:
A moving fluid can form “trapped surfaces” when supersonic flow tips the sound cones past the vertical. |
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Figure 6:
A collapsing vortex geometry (draining bathtub): The green spirals denote streamlines of the fluid flow. The outer circle represents the ergo-surface while the inner circle represents the [outer] event horizon. |
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Figure 7:
Gravity waves in a shallow fluid basin with a background horizontal flow. |
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Figure 8:
Domain wall configuration in ![]() |
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Figure 9:
Ripplons in the interface between two sliding superfluids. |
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Figure 10:
Velocity profile for a left going flow; the profile is dynamically modified with time so that it reaches the profile with a sonic point at the asymptotic future. |
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Figure 11:
One-dimensional velocity profile with a black hole horizon and a white hole horizon. |
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Figure 12:
One-dimensional velocity profile in a ring; the fluid flow exhibits two sonic horizons, one of black hole type and the other of white hole type. |
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http://www.livingreviews.org/lrr-2005-12 |
© Max Planck Society and the author(s)
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