Variable G and the Strong Equivalence Principle

Details Variable G and the Strong Equivalence Principle Variable G and the Strong Equivalence Principle

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ijtp...21..633c&link_type=abstract

International Journal of Theoretical Physics, Volume 21, Issue 8-9, pp. 633-663

Physics

8

Scientific paper

A possible time variability of G, implying a violation of the strong equivalence principle, was first proposed by P. A. M. Dirac in 1937. Since such a feature cannot be accommodated within either Newton’s or Einstein’s theories, a new theoretical framework is needed. In this paper we review one such possible scheme, the scale covariant theory, within which the consequences of a variable G on geophysics, astrophysics, and cosmology can be treated consistently. The global verdict is that G may have varied by as much as a factor of 25 since the time of nucleosynthesis, without any disagreement emerging in any case. In spite of this result, we are not entitled to conclude from our analysis that a variable G has been shown to exist or that it is needed, but only that its variation is compatible with known data. The proof that G varies can in fact only come from direct observations. However, since the previous analyses had concluded that a G( t) would entail severe discrepancies with known data, the reversal of the verdict is believed to be significant, since it may hopefully spur new observational interest in this basic problem.

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