Combined Cassini, LLR, and pulsar observations tighten bounds on scalar-tensor gravity with and without screening, with LLR improving SMG limits by over seven orders of magnitude.
PPN Parameter $\gamma$ and Solar System Constraints of Massive Brans-Dicke Theories
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abstract
Previous solar system constraints of the Brans-Dicke (BD) parameter $\omega$ have either ignored the effects of the scalar field potential (mass terms) or assumed a highly massive scalar field. Here, we interpolate between the above two assumptions and derive the solar system constraints on the BD parameter $\omega$ for {\it any} field mass. We show that for $\omega=O(1)$ the solar system constraints relax for a field mass $m \gsim 20 \times m_{AU}= 20\times 10^{-27}GeV$.
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gr-qc 1years
2019 1verdicts
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Constraining the scalar-tensor gravity theories with and without screening mechanisms by combined observations
Combined Cassini, LLR, and pulsar observations tighten bounds on scalar-tensor gravity with and without screening, with LLR improving SMG limits by over seven orders of magnitude.