Abstract
The 3+1 formalism of Thorne, Price and MacDonald has been used to derive the linear two-fluid equations describing transverse and longitudinal waves propagating in the two-fluid ideal collisionless plasmas surrounding a Schwarzschild black hole. The plasma is assumed to be falling in radial direction toward the event horizon. The relativistic two-fluid equations have been reformulate, in analogy with the special relativistic formulation as explained in an earlier paper, to take account of relativistic effects due to the event horizon. Here a WKB approximation is used to derive the local dispersion relation for these waves and solved numerically for the wave number k.
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Rahman, M.A. Numerical solutions of ideal two-fluid equations very closed to the event horizon of Schwarzschild black hole. Astrophys Space Sci 342, 333–350 (2012). https://doi.org/10.1007/s10509-012-1171-x
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DOI: https://doi.org/10.1007/s10509-012-1171-x