New PostNewtonian Parameter to Test ChernSimons Gravity
Abstract
We study ChernSimons (CS) gravity in the parametrized postNewtonian (PPN) framework through a weakfield 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.
 Publication:

Physical Review Letters
 Pub Date:
 December 2007
 DOI:
 10.1103/PhysRevLett.99.241101
 arXiv:
 arXiv:hepth/0703265
 Bibcode:
 2007PhRvL..99x1101A
 Keywords:

 04.25.Nx;
 04.50.+h;
 04.80.Cc;
 PostNewtonian approximation;
 perturbation theory;
 related approximations;
 Gravity in more than four dimensions KaluzaKlein theory unified field theories;
 alternative theories of gravity;
 Experimental tests of gravitational theories;
 High Energy Physics  Theory;
 Astrophysics;
 General Relativity and Quantum Cosmology
 EPrint:
 4 pages, replaced with version accepted for publication in Phys. Rev. Letters (December, 2007)