Strongly Hyperbolic Extensions of the ADM Hamiltonian
The ADM Hamiltonian formulation of general relativity with prescribed lapse and shift is a weakly hyperbolic system of partial differential equations. In general weakly hyperbolic systems are not mathematically well posed. For well posedness, the theory should be reformulated so that the complete system, evolution equations plus gauge conditions, is (at least) strongly hyperbolic. Traditionally, reformulation has been carried out at the level of equations of motion. This typically destroys the variational and Hamiltonian structures of the theory. Here I show that one can extend the ADM formalism to (a) incorporate the gauge conditions as dynamical equations and (b) affect the hyperbolicity of the complete system, all while maintaining a Hamiltonian description. The extended ADM formulation is used to obtain a strongly hyperbolic Hamiltonian description of Einstein’s theory that is generally covariant under spatial diffeomorphisms and time reparametrizations, and has physical characteristics. The extended Hamiltonian formulation with 1+log slicing and gamma-driver shift conditions is weakly hyperbolic.
KeywordsGauge Condition Canonical Variable Principal Symbol Christoffel Symbol Shift Vector
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- 1.Arnowitt, A., Deser, S., Misner, C.W.: The dynamics of general relativity. In: Witten, L. (ed.) Gravitation: An Introduction to Current Research, pp. 227–265. Wiley, New York (1962)Google Scholar
- 4.Brown, J.D.: in preparationGoogle Scholar
- 12.Hanson, A., Regge, T., Teitelboim, C.: Constrained Hamiltonian Systems. Accademia Nazionale Dei Lincei, Rome (1976)Google Scholar
- 23.Reula, O.A.: Strongly hyperbolic systems in general relativity. gr-qc/0403007 (2004)Google Scholar
- 27.Teitelboim, C.: The Hamiltonian structure of space–time. In: Held, A. (ed.) General Relativity and Gravitation, vol. 1, pp. 195–225. Plenum, New York (1980)Google Scholar