Lesson plan
Shock singularity
In general relativity, the shock singularity, also called the shockwave singularity, the Marolf-Ori singularity, or the outflying singularity, 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. 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). The singularity was first described in 2012 by Donald Marolf and Amos Ori for classical Reissner-Nordström and Kerr black holes. It was numerically confirmed for the spherical charged case in 2016 by Ehud Eilon and Amos Ori.
Article summary
In general relativity, the shock singularity, also called the shockwave singularity, the Marolf-Ori singularity, or the outflying singularity, 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. 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). The singularity was first described in 2012 by Donald Marolf and Amos Ori for classical Reissner-Nordström and Kerr black holes. It was numerically confirmed for the spherical charged case in 2016 by Ehud Eilon and Amos Ori.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
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- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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