The AdS/CFT correspondence relates superstring theory in a specific spacetime (Anti de Sitter (AdS) space) to a quantum field theory living on the (conformal) boundary of this space. This fascinating duality allows us to study strongly coupled conformal field theories (CFTs) by doing calculations in the dual weakly coupled gravitational theory. Thus,
in the context of the AdS/CFT correspondence we use string theory as a mathematical tool to perform calculations relevant for strongly coupled systems that appear in many areas of physics.
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