Principal Symbol of Euler-Lagrange Operators
arXiv:1603.04732 · doi:10.1088/0264-9381/33/14/145012
Abstract
We shall introduce the principal symbol for Euler-Lagrange operators and use them to charac- terise well-posed initial value problems. We shall clarify how constraints can arise in Lagrangian covariant theories by extending the standard treatment in GR. Finally, we sketch a quantization procedure based on what done in LQG.
Some improvements