Non-existence of multiple-black-hole solutions close to Kerr-Newman [PDF]
Willie Wai-Yeung Wong, Pin YuWe show that a stationary asymptotically flat electro-vacuum solution of Einstein's equations that is everywhere locally "almost isometric" to a Kerr-Newman solution cannot admit more than one event horizon. Axial symmetry is not assumed. In particular this implies that the assumption of a single event horizon in Alexakis-Ionescu-Klainerman's proof of perturbative uniqueness of Kerr black holes is in fact unnecessary.View original: http://arxiv.org/abs/1210.1379
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