%0 Journal Article %T Exact Massive Solutions of Classical Massless Field Theories %A Frasca %A Marco %J High Energy Physics - Phenomenology %D 2008 %I %X We give the exact solution of classical equation of motion of a quartic scalar massless field theory showing that this is massive and is represented by a superposition of free particle solutions with a discrete spectrum. Then we show that this is also a solution of the classical Yang-Mills field theory that is so proved acquiring mass by dynamical evolution with a corresponding discrete mass spectrum. Finally we develop quantum field theory starting with this solution. %U http://arxiv.org/abs/0807.2179