Shock singularity

In black hole physics, the shock singularity, also called the shockwave singularity,^[1] the Malorf-Ori singularity,^[2][3] or the outflying singularity,^[2][4] is a null singularity propagating out of the outgoing section of the inner horizon of a spinning or charged black hole that effectively manifests as a gravitational shockwave.^[1][2] Perturbations to the inner horizon result in abrupt changes in the amplitude of perturbing fields and the metric tensor itself, manifesting as an effective shockwave for sufficiently late-infall observers (v_eh⪆15-20).^[1][5] The singularity was first described in 2012 by Donald Marolf and Amos Ori for classical Reissner-Nordström and Kerr black holes.^[1] It was numerically confirmed for the spherical charged case in 2016 by Ehud Eilon and Amos Ori.^[5]