Limits on the variability of G using binarypulsar data
Abstract
One of the few experimental handles on unified theories of gravity with other interactions comes from possible time variation of coupling constants over the Hubble time: H^{1}_{0}~=(7.67×10^{11} yr^{1})^{1}. We present a new theoryindependent estimate (consistent with zero) of the time variation of Newton's gravitational constant derived from the timing of the binary pulsar PSR 1913+16: G_{0}/G_{0}=(1.0+/2.3)×10^{11} yr^{1}. We anticipate that this estimate will become sharper as more data are acquired.
 Publication:

Physical Review Letters
 Pub Date:
 September 1988
 DOI:
 10.1103/PhysRevLett.61.1151
 Bibcode:
 1988PhRvL..61.1151D
 Keywords:

 Binary Stars;
 Gravitational Constant;
 Pulsars;
 Acceleration;
 Center Of Mass;
 Nuclear Fusion;
 Astrophysics;
 04.80.+z;
 04.50.+h;
 06.20.Jr;
 97.60.Gb;
 Gravity in more than four dimensions KaluzaKlein theory unified field theories;
 alternative theories of gravity;
 Determination of fundamental constants;
 Pulsars