  In this note we do the analysis of entanglement entropy more carefully when
the non-conformal theory flows to a non-trivial IR fixed point. In particular
we emphasize the role of the trace of the energy-momentum tensor in these
calculations. We also compare the current technique for evaluating the
entanglement entropy, particularly the Green's function method for gaussian
theories, with the dilaton effective action approach and show that they compute
identical quantities. As a result of this, the dilaton effective action
approach can be thought of as an extension of Green's function technique to
interacting theories.
