Identically closed two-form for covariant phase space quantization of   Dirac-Nambu-Goto p-branes in a curved spacetime
  Using a fully covariant formalism given by Carter for the deformation dynamics of p-branes governed by the Dirac-Nambu-Goto action in a curved background, it is proved that the corresponding Witten's phase space is endowed with a covariant symplectic structure, which can serve as a starting point for a phase space quantization of such objects. Some open questions for further research are outlined. 
R. Cartas-Fuentevilla (Universidad Autonoma de Puebla, Mexico)