An elementary formalism is described to generate series of massless radial excitations within a relativistic BS (confinement) model, thus excluding orbital excitations. Coupling the photon to the constituent scalar, a finite self-mass integral results in the lowest order of a. It represents an infinite system of self-consistent equations for an infinite number of leptonic masses. The system can...

We review the calculation of the spectrum of glueball masses in non-supersymmetric Yang-Mills theory using the conjectured duality between supergravity and large N gauge theories. The glueball masses are obtained by solving the supergravity wave equations in a black hole geometry. The glueball masses found this way are in unexpected agreement with the available lattice data. We also show how to...