Much more information from a previous phys.org: https://phys.org/news/2019-05-constraints-symmetries-holography.html https://phys.org/news/2019-05-constraints-

Much more information from a previous phys.org: https://phys.org/news/2019-05-constraints-symmetries-holography.html https://phys.org/news/2019-05-constraints-symmetries-hologra... Their work assumes the AdS/CFT correspondence. "Our new paper provides a rigorous proof of this claim in the context of the AdS/CFT correspondence, where quantum gravity is defined in a mathematically precise way, and we have done so in the most general way, excluding all possible global symmetries from quantum gravity,"