  We study the virial mass discrepancy in the context of a DPG brane-world
scenario and show that such a framework can offer viable explanations to
account for the mass discrepancy problem. This is done by defining a
geometrical mass $\mathcal{N}$ that we prove to be proportional to the virial
mass. Estimating $\mathcal{N}$ using observational data, we show that it
behaves linearly with $r$ and has a value of the order of $M_{200}$, pointing
to a possible resolution of the virial mass discrepancy. We also obtain the
radial velocity dispersion of galaxy clusters and show that it is compatible
with the radial velocity dispersion profile of such clusters. This velocity
dispersion profile can be used to differentiate various models predicting the
virial mass.
