Quanta Magazine
https://www.quantamagazine.org/why-is-m-theory-the-leading-candidate-for-theory-of-everything-20171218/
Dec 18, 2017 · AdS/CFT gives a complete definition of M-theory for the special case of AdS space-time geometries, which are infused with negative energy that makes them bend in a different way than our universe does. For such imaginary worlds, physicists can describe processes at all energies, including, in principle, black hole formation and evaporation.
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