In this thesis we will focus our attention on two particular supermultiplets. The multiplet
containing conserved currents and the multiplet containing the stress-energy tensor,
which in the following will be referred to as current supermultiplet and supercurrent
multiplet, respectively. There are two main reasons why we have chosen these particular
supermultiplets. First, they are (quite) universal: the supercurrent multiplet is defined in
any supersymmetric QFT whereas the current supermultiplet only requires the existence
of a preserved global internal symmetry, to be defined. The second main reason is that the operators populating these multiplets have protected dimensions. This is in fact a
crucial point in our holographic approach. An operator whose dimension is not protected
usually gets a huge anomalous dimension at large 't Hooft coupling and this means that
its holographic dual is not captured by the supergravity approximation we will be using.
In fact, such operators typically correspond t massive stringy states, which get projected
out by taking the alpha' --> 0 limit.
