New post-newtonian parameter to test chern-simons gravity

Stephon Alexander, Nicolas Yunes

Research output: Contribution to journalArticlepeer-review


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 experiments, such as Gravity Probe B, to bound CS gravity and test string theory.

Original languageEnglish (US)
Article number241101
JournalPhysical review letters
Issue number24
StatePublished - Dec 10 2007
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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