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Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phrva..36.1786c&link_type=abstract
Physical Review A (General Physics), Volume 36, Issue 4, August 15, 1987, pp.1786-1794
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Other Topics In General Relativity And Gravitation, Other Topics In Mathematical Methods In Physics
Scientific paper
This paper deals within the relativistic framework with the wave propagation in magnetizable fluids, assumed to be perfect, magnetically soft, isotropic, and inhomogeneous with an arbitrary isotropic law χ=χ(T,r,||b||2) (χ,T,r,||b|| being the magnetic susceptibility, the proper temperature, the proper material density, and the strength of the magnetic field, respectively). The characteristic manifolds of the flow are determined in a very elegant and rigorous manner which avoids the extensive algebraic manipulations one usually encounters in the classical methods of characteristics. It is shown that in a magnetic medium there exists a hyperbolic region of nonsteady flows of magnetizable fluids. This implies the existence of magnetosonic waves of the same kind as in nonmagnetic fluids (χ or μ=const), that is, as in ordinary magnetohydrodynamics. However, in magnetic fluids there is the possibility of the development of instabilities similar to that which arise in nonmagnetic fluids with transverse and longitudinal pressure [M. Cissoko, Ann. Mat. Pura Appl. 111, 331 (1976)].
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