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Hamilton-Jacobi equations and brane associated Lagrangians. (English) Zbl 0972.81146
Summary: This article seeks to relate a recent proposal for the association of a covariant Field Theory with a string or brane Lagrangian to the Hamilton-Jacobi formalism for strings and branes. It turns out that since in this special case, the Hamiltonian depends only upon the momenta of the Jacobi fields and not the fields themselves, it is the same as a Lagrangian, subject to a constancy constraint. We find that the associated Lagrangians for strings or branes have a covariant description in terms of the square root of the same Lagrangian. If the Hamilton-Jacobi function is zero, rather than a constant, then it is in in one dimension lower, reminiscent of the “holographic” idea. In the second part of the paper, we discuss properties of these Lagrangians, which lead to what we have called “Universal Field Equations”, characteristic of covariant equations of motion.

81T30 String and superstring theories; other extended objects (e.g., branes) in quantum field theory
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