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In cond-mat/9906332; Phys. Rev. Lett. 84, 822 (2000) and physics/9906038;Phys. Rev. A 60, 4301 (1999) Leonhardt and Piwnicki have presented aninteresting analysis of how to use a flowing dielectric fluid to generate aso-called "optical black hole". Qualitatively similar phenomena usingacoustical processes have also been much investigated. Unfortunately there is atechnical error in the Leonhardt-Piwnicki analysis regarding these "opticalblack holes": While it is clear that "optical black holes" can certainly existas theoretical constructs, and while the experimental prospects for actuallybuilding them in the laboratory are excellent, the particular model geometriesthat Leonhardt and Piwnicki write down as alleged examples of "optical blackholes" are in fact not black holes at all.
Matt Visser (Mon,) studied this question.
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