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Jordan and Einstein Frames from the perspective of ω=-3/2 Hamiltonian Brans-Dicke theory

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arxiv 2110.12222 v2 pith:TUSSRZK5 submitted 2021-10-23 gr-qc astro-ph.COhep-th

Jordan and Einstein Frames from the perspective of ω=-3/2 Hamiltonian Brans-Dicke theory

classification gr-qc astro-ph.COhep-th
keywords frameshamiltonianconstraintdiraceinsteinjordanomegaalgebra
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We carefully perform a Hamiltonian Dirac's constraint analysis of $\omega=-\frac{3}{2}$ Brans-Dicke theory with Gibbons-Hawking-York (GHY) boundary term. The Poisson brackets are computed via functional derivatives. After a brief summary of the results for $\omega\neq-\frac{3}{2}$ case, we derive all Hamiltonian Dirac's constraints and constraint algebra both in the Jordan and Einstein frames. Confronting and contrasting Dirac's constraint algebra in both frames, it is shown that they are not equivalent. This highlights the transformations from the Jordan to the Einstein frames are not Hamiltonian canonical transformations.

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Cited by 1 Pith paper

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  1. Canonical Clock Sectors and Relational Frame Equivalence in Brans--Dicke Theory

    gr-qc 2026-07 accept novelty 6.0

    Apparent Jordan–Einstein inequivalence after relational deparametrization is a clock-sector mismatch; a frame-adapted canonical chart restores identical reduced Hamiltonians.