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ON THE SUPERRADIANCE OF SPIN--l WAVES IN AN EQUATORIAL WEDGE AROUND A KERR HOLE

机译:关于自旋l波在喀尔孔周围的赤道楔形中的优越性

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摘要

Recently Van Putten has suggested that superradiance of magnetosonic waves in a toroidal magnetosphere around a Kerr black hole may play a role in the central engine of gamma-ray bursts. In this context, he computed (in the WKB approximation) the superradiant amplification of scalar waves confined to a thin equatorial wedge around a Kerr hole and found that the superradiance is higher than for radiation incident over all angles. This Letter presents calculations of both spin-0 (scalar) superradiance (integrating the radial equation rather than using the WKB method) and spin-l (electromagnetic/magnetosonic) superradiance in Van Putten's wedge geometry. In contrast to the scalar case, spin-l superradiance decreases in the wedge geometry, decreasing the likelihood of its astrophysical importance.
机译:最近,范普顿(Van Putten)提出,克尔(Kerr)黑洞周围的环形磁层中的磁声波超辐射可能在伽马射线爆发的中央引擎中起作用。在这种情况下,他计算(以WKB近似)被限制在Kerr孔周围的薄赤道楔形的标量波的超辐射放大倍数,并发现该超辐射高于在所有角度入射的辐射。这封信介绍了Van Putten楔形几何体中自旋0(标量)超辐射(集成径向方程式而不是使用WKB方法)和自旋1(电磁/磁声)超辐射的计算。与标量情况相反,自旋1超辐射的楔形几何形状减小,从而降低了其天体重要性的可能性。

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