AA << demonstrated how to describe the shape of any symmetrical wormhole - a black hole that theoretically can be a kind of a portal between any two points in space and time - based on its wave spectrum >>
Physicist describes the shape of a wormhole. RUDN University. Oct 17, 2018.
https://m.phys.org/news/2018-10-physicist-wormhole.html
R.A.Konoplya. How to tell the shape of a wormhole by its quasinormal modes. Physics Letters B. Volume 784 Sep 10, 2018 Pages 43-49 doi: 10.1016/j.physletb.2018.07.025
https://www.sciencedirect.com/science/article/pii/S037026931830563X