PPN meets EFT of dark energy: Post-Newtonian approximation in higher-order scalar-tensor theories
arXiv:2402.10459 · doi:10.1088/1475-7516/2024/06/040
Abstract
We study the post-Newtonian limit of higher-order scalar-tensor theories that are degenerate in the unitary gauge. They can be conveniently described by the effective field theory (EFT) of dark energy. We determine all the parametrized post-Newtonian (PPN) parameters in terms of the EFT of dark energy parameters. Experimental bounds on the PPN parameters are then translated to constraints on the EFT parameters. We present a Lagrangian of a unitary degenerate higher-order scalar-tensor theory characterized by a single function of the kinetic term of the scalar field whose PPN parameters have the same values as in general relativity.
arXiv comment18 pages, 2 figures
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