Towards a covariant canonical formulation for closed topological defects   without boundaries
  On the basis of the covariant description of the canonical formalism for quantization, we present the basic elements of the symplectic geometry for a restricted class of topological defects propagating on a curved background spacetime. We discuss the future extensions of the present results. 
R. Cartas-Fuentevilla (Universidad Autonoma de Puebla, Mexico)