# CFT Entanglement Entropy and Topological Terms in Gravity

In 2006, Ryu and Takayanagi provided a general recipe on how to compute

entanglement entropy of a Conformal Field Theory using gauge/gravity

duality. This holographic prescription, which considers the extension of

the entangling region from the boundary into an Einstein space bulk, has

produced remarkable insight on general properties of strongly correlated

systems. However, this progress has been made on a rather case-by-case

basis, as it requires proper renormalization of the gravity action in

the bulk.