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- W4308996546 abstract "In Ref. [1], exact (not only conformally related) analogue models for the Schwarzschild and Reissner-Nordstrom spacetimes were found. The background non-relativistic fluid flow was sustained by an external body force which is not affected by the linearised fluctuations. Following a different route, by modelling the external force as the gradient of an external pressure, it was shown in~cite{bilic} that the speed of sound is significantly modified. This effective speed of sound turns out to be inconsistent with the continuity equation. In this comment we analyse these two contradictory conclusions. We first show that the heuristic justification for the introduction of the external force via a variational principle given in Ref. [2] is conceptually incorrect. Then, by adding the external force appropriately, we show that the conclusions in [1] remain valid." @default.
- W4308996546 created "2022-11-20" @default.
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- W4308996546 date "2022-11-14" @default.
- W4308996546 modified "2023-10-17" @default.
- W4308996546 title "Comment on “Analog Schwarzschild-like geometry in fluids with external pressure”" @default.
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- W4308996546 doi "https://doi.org/10.1103/physrevd.106.108501" @default.
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