Bonn 2020 – scientific programme
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GR: Fachverband Gravitation und Relativitätstheorie
GR 11: Alteranative Classical Theories of Gravitation
GR 11.3: Talk
Thursday, April 2, 2020, 14:30–14:45, H-HS V
Post-Newtonian limit of general scalar-torsion theories of gravity — •Kai Flathmann1 and Manuel Hohmann2 — 1Institute for Physics, University of Oldenburg, 26129 Oldenburg, Germany — 2Laboratory of Theoretical Physics, Institute of Physics, University of Tartu, 50411 Tartu, Estonia
In this talk we derive the post-Newtonian limit of a general class of teleparallel theories of gravity, where the action is a free function of the Torsion scalar and several quantities derived from a dynamical scalar field. In order to use the parameterized post-Newtonian (PPN) formalism without modifications, such as introducing an effective gravitational constant, we restrict the analysis to a massless scalar field. This class of theories is fully conservative, with only two non-vanishing PPN parameters. For a particular choice of the free function, the theory is even indistinguishable from General Relativity in its post-Newtonian approximation.