A new PPN parameter to test Chern-Simons gravity

Details A new PPN parameter to test Chern-Simons gravity A new PPN parameter to test Chern-Simons gravity

2007-03-28

arxiv.org/abs/hep-th/0703265v2

Phys.Rev.Lett.99:241101,2007

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, replaced with version accepted for publication in Phys. Rev. Letters (December, 2007)

Scientific paper

10.1103/PhysRevLett.99.241101

We study Chern-Simons (CS) gravity in the parameterized 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 experiments, such as Gravity Probe B, to bound CS gravity and test string theory.

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