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arXiv · 1909.09355

Post-Newtonian limit of scalar-torsion theories of gravity as analogue to scalar-curvature theories

Elena D. Emtsova·Manuel Hohmann
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Abstract

We consider a recently proposed class of extended teleparallel theories of gravity, which entail a scalar field which is non-minimally coupled to the torsion of a flat, metric-compatible connection. This class of scalar-torsion theories of gravity is constructed in analogy to and as a direct extension of the well-studied class of scalar-curvature gravity theories, and has various common features, such as the conformal frame freedom. For this class we determine the parametrized post-Newtonian limit, both for a massive and a massless scalar field. In the massive case, we determine the effective gravitational constant and the post-Newtonian parameter $\gamma$, both of which depend on the distance between the gravitating and test masses. In the massless case, we calculate the full set of parameters and find that only $\gamma$ and $\beta$ potentially deviate from their general relativity values. In particular, we find that for a minimally coupled scalar field the theory becomes indistinguishable from general relativity at this level of the post-Newtonian approximation.

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Elena D. Emtsova, Manuel Hohmann. 2019-09-20. Post-Newtonian limit of scalar-torsion theories of gravity as analogue to scalar-curvature theories. https://doi.org/10.1103/physrevd.101.024017

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