Reversing Renormalization-Group Flows with AdS/CFT

Understand

For scalar fields in AdS with masses slightly above the Breitenlohner-Freedman bound, appropriate non-local boundary conditions can define a unitary theory.

• Such boundary conditions correspond to non-local deformations of the dual CFT, and generate a non-local renormalization-group flow.
• Nevertheless, a bulk analysis suggests that certain such flows lead to local CFTs in the infra-red.
• Since the flows are non-local, they can either increase or decrease the central charge of the CFT.