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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 moving fluid can form an “acoustic horizon” when supersonic flow prevents upstream motion of sound waves. |
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Figure 7:
A collapsing vortex geometry (draining bathtub): The green spirals denote streamlines of the fluid flow. The outer circle represents the ergo-surface (ergo-circle) while the inner circle represents the [outer] event horizon. |
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Figure 8:
Conformal diagram of an acoustic black hole. |
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Figure 9:
Conformal diagram of an acoustic black-hole–white-hole pair. Note the complete absence of singularities. |
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Figure 10:
Gravity waves in a shallow fluid basin with a background horizontal flow. |
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Figure 11:
Domain wall configuration in 3He. |
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Figure 12:
Ripplons in the interface between two sliding superfluids. |
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Figure 13:
The graphene hexagonal lattice is made of two inter-penetrating triangular lattices. Each is associated with one Fermi point. |
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Figure 14:
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 15:
The picture shows a subsonic dispersion relation as a relation ![]() ![]() ![]() ![]() |
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Figure 16:
The picture shows a supersonic dispersion relation as a relation ![]() ![]() ![]() ![]() |
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Figure 17:
One-dimensional velocity profile with a black-hole horizon. |
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Figure 18:
One-dimensional velocity profile with a white-hole horizon. |
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Figure 19:
One-dimensional velocity profile with a black-hole horizon and a white-hole horizon. |
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Figure 20:
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. |
http://www.livingreviews.org/lrr-2011-3 |
Living Rev. Relativity 14, (2011), 3
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