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General Relativity and Quantum Cosmology, gr-qc,Mathematical Physics, math-ph,Mathematics, Mathematical Physics, math.MP
Abstract:
We consider the sets of future/past trapped null geodesics in the exterior
region of a sub-extremal Kerr-Newman-Taub-NUT spacetime. We show that, from the
point of view of any timelike observer outside of such a black hole, trapping
can be understood as two smooth sets of spacelike directions on the celestial
sphere of the observer.