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We apply the Dirac procedure for constrained systems to the Arnowitt-Deser-Misner formalism linearized around the Friedmann-Lemaitre universe.
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Viatcheslav F. Mukhanov, H. A. Feldman, and Robert H. Brandenberger · 1992
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Gauge invariant variables for cosmological perturbation theory using geometrical clocks
Kristina Giesel, Adrian Herzog, and Parampreet Singh · 2018
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