Comments on a-maximization from gauged supergravity

In this talk I will discuss the holographic realization of a-maximization in five-dimensional gauged supergravity. After reviewing the relevant details of the holographic description of a-maximization, I will discuss its application to a particular consistent truncation of M-theory to five-dimensional gauged supergravity. This theory contains AdS_5 solutions which are dual to SCFTs arising as the IR limit of M5-branes wrapped on Riemann surfaces and I will illustrate how one can use holographic techniques to determine the U(1)_R symmetry.