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arXiv · 0704.0299

Parametrized Post-Newtonian Expansion of Chern-Simons Gravity

Stephon Alexander·Nicolas Yunes
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Abstract

We investigate the weak-field, post-Newtonian expansion to the solution of the field equations in Chern-Simons gravity with a perfect fluid source. In particular, we study the mapping of this solution to the parameterized post-Newtonian formalism to 1 PN order in the metric. We find that the PPN parameters of Chern-Simons gravity are identical to those of general relativity, with the exception of the inclusion of a new term that is proportional to the Chern-Simons coupling parameter and the curl of the PPN vector potentials. We also find that the new term is naturally enhanced by the non-linearity of spacetime and we provide a physical interpretation for it. By mapping this correction to the gravito-electro-magnetic framework, we study the corrections that this new term introduces to the acceleration of point particles and the frame-dragging effect in gyroscopic precession. We find that the Chern-Simons correction to these classical predictions could be used by current and future experiments to place bounds on intrinsic parameters of Chern-Simons gravity and, thus, string theory.

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Stephon Alexander, Nicolas Yunes. 2007-04-03. Parametrized Post-Newtonian Expansion of Chern-Simons Gravity. https://doi.org/10.1103/physrevd.75.124022

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