  Recently, it has been conjectured that supergravity solutions with two
asymptotically AdS regions describe the RG flow of a 4-d field theory from a UV
fixed point to an interacting IR fixed point. In this paper we lend support to
this conjecture by showing that, in the UV (IR) limit, the two-point function
of a minimally-coupled scalar field depends only on the UV (IR) region of the
metric, asymptotic to AdS_5. This result is consistent with the interpretation
of the radial coordinate of Anti de Sitter space as an energy scale, and it may
provide an analog of the Callan-Symanzik equation for supergravity duals of
strongly coupled field theories.
