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arXiv · 1910.01023

Post-Newtonian limit of generalized scalar-torsion theories of gravity

Kai Flathmann·Manuel Hohmann
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Abstract

In this article we derive the post-Newtonian limit of a class of teleparallel theories of gravity, where the action is a free function $L(T,X,Y,\phi)$ of the Torsion scalar $T$ and scalar quantities $X$ and $Y$ built from the dynamical scalar field $\phi$. We restrict the analysis to a massless scalar field in order to use the parameterized post-Newtonian formalism without modifications, such as introducing an effective gravitational constant which depends on the distance between the interacting masses. In particular the results show a class of fully-conservative theories of gravity, where the only non-vanishing parameters are $\gamma$ and $\beta$. For a particular choice of the function $L(T,X,Y,\phi)$ the theory cannot be distinguished from General Relativity in its post-Newtonian approximation.

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Kai Flathmann, Manuel Hohmann. 2019-10-01. Post-Newtonian limit of generalized scalar-torsion theories of gravity. https://doi.org/10.1103/physrevd.101.024005

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