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• W3099010807 abstract "We perform a Hamiltonian analysis of a large class of scalar-tensor Lagrangians which depend quadratically on the second derivatives of a scalar field. By resorting to a convenient choice of dynamical variables, we show that the Hamiltonian can be written in a very simple form, where the Hamiltonian and the momentum constraints are easily identified. In the case of degenerate Lagrangians, which include the Horndeski and beyond Horndeski quartic Lagrangians, our analysis confirms that the dimension of the physical phase space is reduced by the primary and secondary constraints due to the degeneracy, thus leading to the elimination of the dangerous Ostrogradski ghost. We also present the Hamiltonian formulation for nondegenerate theories and find that they contain four degrees of freedom, as expected. We finally discuss the status of the unitary gauge from the Hamiltonian perspective." @default.
• W3099010807 created "2020-11-23" @default.
• W3099010807 creator A5030296247 @default.
• W3099010807 creator A5039331757 @default.
• W3099010807 date "2016-07-12" @default.
• W3099010807 modified "2023-10-17" @default.
• W3099010807 title "Hamiltonian analysis of higher derivative scalar-tensor theories" @default.
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• W3099010807 doi "https://doi.org/10.1088/1475-7516/2016/07/016" @default.
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