Giovanni Landi
Eigenvalues as Dynamical Variables
(47K, latex)

ABSTRACT.  We review some work done with C. Rovelli on the use of the eigenvalues of the 
Dirac operator on a curved spacetime as dynamical variables, the main 
motivation coming from their invariance under the action of diffeomorphisms. 
The eigenvalues constitute an infinite set of ``observables'' for general 
relativity and can be taken as variables for an invariant description of the 
gravitational field dynamics.