DECAY-ESTIMATES FOR SPHERICALLY SYMMETRICAL YANG-MILLS FIELDS IN MINKOWSKI SPACE-TIME

We consider Yang-Nills fields in Minkowski space-time R(3+1). We prove global existence and establish decay estimates for any initial data which is sufficiently small in a specified energy norm and which is spherically symmetric in the :sense of principal bundles. We consider initial data which lead to bounded solutions near the central line. The proof of the global result is achieved using wighted Sobolev norms of the Klainerman type. They not only provide global existence, but also sharp asymptotic behaviour of the solutions in time. The initial data considered here does not include Coulomb charges but includes dipole radiation, a situation which cannot be acomodated in the framework of the conformal method. A new class of solutions, which have not been considered before, is covered then by the theorem.