Warped space-time for phonons moving in a perfect nonrelativistic fluid

Details Warped space-time for phonons moving in a perfect nonrelativistic fluid Warped space-time for phonons moving in a perfect nonrelativistic fluid

2002-11-08

arxiv.org/abs/gr-qc/0211029v3

Europhys.Lett.62:1-7,2003

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages, 1 figure. Version as published; references updated

Scientific paper

10.1209/epl/i2003-00103-6

We construct a kinematical analogue of superluminal travel in the ``warped'' space-times curved by gravitation, in the form of ``super-phononic'' travel in the effective space-times of perfect nonrelativistic fluids. These warp-field space-times are most easily generated by considering a solid object that is placed as an obstruction in an otherwise uniform flow. No violation of any condition on the positivity of energy is necessary, because the effective curved space-times for the phonons are ruled by the Euler and continuity equations, and not by the Einstein field equations.

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