A covariant canonical decomposition of the bosonic and spinning extended objects with electric charge

By introducing a time-like vector field n(sup a) (hence a choice of an invariant time parameter (tau)) the action of a spinning extended object in d-dimensions can be covariantly decomposed into the analog of a center of mass part and a space-like internal part. In this way the action has the same form as that of a point particle which is convenient for the interpretation of the theory, its covariant canonical quantization, and for the definition of the form factors.