HAMILTON–JACOBI FORMALISM FOR STRINGS
Y. Nambu · World Scientific series in 20th century physics · 1995
Abstract It is shown that a Hamilton—Jacobi-type formalism can be set up to deal with the classical dynamics of relativistic strings and other one-dimensional extended systems. A special feature is that the formalism involves two evolution parameters which are treated on an equal footing. The corresponding Hamilton—Jacobi functions turn out to be vector potentials or Clebsch potentials, and in this sense we find a link between the string model and gauge field theory.