An alternate Hamiltonian formulation of fourth-order theories and its application to cosmology

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dc.creatorSchmidt, Hans - Jürgen
dc.date1995-01-18
dc.date.accessioned2026-07-07T03:30:37Z
dc.date.available2026-07-07T03:30:37Z
dc.descriptionAn alternate Hamiltonian H different from Ostrogradski's one is found for the Lagrangian L = L(q, \dot q, \ddot q). We add a suitable divergence to L and insert a=q and b=\ddot q. Contrary to other approaches no constraint is needed because \ddot a = b is one of the canonical equations. Another canonical equation becomes equivalent to the fourth-order Euler-Lagrange equation of L. Usually, H becomes quadratic in the momenta, whereas the Ostrogradski approach has Hamiltonians always linear in the momenta. For non-linear L=F(R), G=dF/dR \ne 0 the Lagrangians L and \hat L=\hat F(\hat R) with \hat F=2R/G\sp 3-3L/G\sp 4, \hat g_{ij}=G\sp 2g_{ij} and \hat R=3R/G\sp 2 - 4L/G \sp 3 give conformally equivalent fourth-order field equations being dual to each other. This generalizes Buchdahl's result for L=R^2. The exact fourth-order gravity cosmological solutions found by Accioly and Chimento are interpreted from the viewpoint of the instability of fourth-order theories and how they transform under this duality. Finally, the alternate Hamiltonian is applied to deduce the Wheeler-De Witt equation for fourth-order gravity models more systematically than before.
dc.description29 pages, latex, no figures, hjschmi@rz.uni-potsdam.de
dc.identifierhttps://arxiv.org/abs/gr-qc/9501019
dc.identifierhttp://arxiv.org/abs/gr-qc/9501019
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/35586
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleAn alternate Hamiltonian formulation of fourth-order theories and its application to cosmology
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