 AdS/CFT correspondence

The AdS/CFT correspondence identifies a conformal field theory with quantum gravity on an asymptotically anti-de Sitter spacetime. Boundary sources couple to CFT operators and equal boundary values of bulk fields.

The AdS/CFT correspondence, also known as the Anti-de Sitter/Conformal Field Theory correspondence, is a theoretical framework in theoretical physics that relates two seemingly different types of physical theories. Specifically, it suggests a relationship between a type of string theory formulated on a certain geometric space known as Anti-de Sitter (AdS) space and a conformal field theory (CFT) defined on the boundary of that space.