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- W1972613765 abstract "We describe a simple dynamical model characterized by the presence of two noncommuting Hamiltonian constraints. This feature mimics the constraint structure of general relativity, where there is one Hamiltonian constraint associated with each space point. We solve the classical and quantum dynamics of the model, which turns out to be governed by an $mathrm{SL}(2,R)$ gauge symmetry, local in time. In classical theory, we solve the equations of motion, find an $mathrm{SO}(2,2)$ algebra of Dirac observables, find the gauge transformations for the Lagrangian and canonical variables and for the Lagrange multipliers. In quantum theory, we find the physical states, the quantum observables, and the physical inner product, which is determined by the reality conditions. In addition, we construct the classical and quantum evolving constants of the system. The model illustrates how to describe physical gauge-invariant relative evolution when coordinate time evolution is a gauge." @default.
- W1972613765 created "2016-06-24" @default.
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- W1972613765 date "1999-07-14" @default.
- W1972613765 modified "2023-09-25" @default.
- W1972613765 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi mathvariant=normal>SL</mml:mi><mml:mn /><mml:mo>(</mml:mo><mml:mn>2</mml:mn><mml:mo>,</mml:mo><mml:mi>R</mml:mi><mml:mo>)</mml:mo><mml:mn /></mml:math>model with two Hamiltonian constraints" @default.
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- W1972613765 doi "https://doi.org/10.1103/physrevd.60.044009" @default.
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