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Review: Dirac's Observables for the Rest-Frame Instant Form of Tetrad Gravity in a Completely Fixed 3-Orthogonal Gauge

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Abstract

We define the rest-frame instant form of tetrad gravity restricted to Christodoulou-Klainermann spacetimes. After a study of the Hamiltonian group of gauge transformations generated by the 14 first class constraints of the theory, we define and solve the multitemporal equations associated with the rotation and space diffeomorphism constraints, finding how the cotriads and their momenta depend on the corresponding gauge variables. This allows to find a quasi-Shanmugadhasan canonical transformation to the class of 3-orthogonal gauges and to find the Dirac observables for superspace in these gauges. The construction of the explicit form of the transformation and of the solution of the rotation and supermomentum constraints is reduced to solve a system of elliptic linear and quasi-linear partial differential equations. We then show that the superhamiltonian constraint becomes the Lichnerowicz equation for the conformal factor of the 3-metric and that the last gauge variable is the momentum conjugated to the conformal factor. The gauge transformations generated by the superhamiltonian constraint perform the transitions among the allowed foliations of spacetime, so that the theory is independent from its 3+1 splittings. In the special 3-orthogonal gauge defined by the vanishing of the conformal factor momentum we determine the final Dirac observables for the gravitational field even if we are not able to solve the Lichnerowicz equation. The final Hamiltonian is the weak ADM energy restricted to this completely fixed gauge.

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Authors and Affiliations

  1. Dipartimento di Fisica, Campus Universitario, Università di Parma, Viale delle Scienze, 43100, Parma, Italy

    Roberto De Pietri

  2. Sezione INFN di Firenze, L.go E.Fermi 2 (Arcetri), 50125, Firenze, Italy

    Luca Lusanna

  3. Dipartimento di Fisica, Università di Milano I, via G.Celoria 16, 20133, Milano, Italy

    Luca Martucci

  4. Condominio dei Pioppi 16, 6916, Grancia (Lugano), Switzerland

    Stefano Russo

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  1. Roberto De Pietri
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  2. Luca Lusanna
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  3. Luca Martucci
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  4. Stefano Russo
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De Pietri, R., Lusanna, L., Martucci, L. et al. Review: Dirac's Observables for the Rest-Frame Instant Form of Tetrad Gravity in a Completely Fixed 3-Orthogonal Gauge. General Relativity and Gravitation 34, 877–1033 (2002). https://doi.org/10.1023/A:1016369931750

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