Abstract:Abstract. We show that in the equatorial plane of marginally stable thick discs (with uniformly distributed specific angular momentum ℓ(r, θ ) = const) the orbital velocity relative to the LNRF has a positive radial gradient in the vicinity of black holes with a > 0.99979. The change of sign of the velocity gradient occurs just above the center of the thick toroidal discs, in the region where stable circular geodesics of the Kerr spacetime are allowed. The global character of the phenomenon is given in terms o… Show more
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