5 ms·
OSM - slight generalization of Schwarzshild BH, where you take evolving spherically-symmetric mass distribution instead of point mass - shows that point singula
by NooneAtAll3 22d ago
OSM - slight generalization of Schwarzshild BH, where you take evolving spherically-symmetric mass distribution instead of point mass - shows that point singularity in the middle can be naked (aka observable), so it's not just QM that causes worms...
https://en.wikipedia.org/wiki/Oppenheimer–Snyder_model https://en.wikipedia.org/wiki/Oppenheimer–Snyder_model
- sigmoid10 22d agoIt is not difficult to construct geometries with naked singularities. Reissner, Nordström, Weyl and others individually came up with one long before Oppenheimer. You can also construct geometries where faster than light travel is possible. But all of these suffer from fundamentally unphysical energy conditions. Quantum mechanics may change the picture because it allows weirder energy states than normal physics because everything fluctuates. But it is unknown if and how this actually affects gravity.
- Ajoha 22d agoThanks, I enjoyed your answers !