  We construct a three-dimensional geometry interpolating two different AdS
spaces. From the dual quantum field theory viewpoint, it corresponds to a
nontrivial renormalization group flow from a UV to another IR conformal field
theory. On this geometry, we discuss the change of the central charge in a
momentum-space and real-space renormalization group flow. The result shows in
both renormalization prescriptions that the central charge monotonically
decreases along the renormalization group flow.
