Mass spectrum in a conformally invariant Brans-Dicke theory

In this paper it is shown that the Brans-Dicke theory, for a special case, is conformally invariant. For the case that the energy-momentum tensor of matter is zero, i.e., for particlelike solutions, an explicit solution for the scalar field phi and for the metric tensor is found. Imposing certain natural boundary conditions leads to the result that, far away, the net effect of this solution is to appear as a particle which has a discrete mass spectrum and an event horizon which is less than the ordinary Schwarzschild radius