# New post-Newtonian parameter to test Chern-Simons gravity.

@article{Alexander2007NewPP, title={New post-Newtonian parameter to test Chern-Simons gravity.}, author={Stephon H. S. Alexander and Nicol{\'a}s Yunes}, journal={Physical review letters}, year={2007}, volume={99 24}, pages={ 241101 } }

We study Chern-Simons (CS) gravity in the parametrized post-Newtonian (PPN) framework through a weak-field solution of the modified field equations. We find that CS gravity possesses the same PPN parameters as general relativity, except for the inclusion of a new term, proportional to the CS coupling and the curl of the PPN vector potential. This new term leads to a modification of frame dragging and gyroscopic precession and we provide an estimate of its size. This correction might be used in…

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