Publication Abstracts

Canuto 1982

Canuto, V.M., 1982: Variable G and the strong equivalence principle. Int. J. Theor. Phys., 21, 633-663, doi:10.1007/BF02650231.

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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BibTeX Citation

@article{ca04220f,
  author={Canuto, V. M.},
  title={Variable G and the strong equivalence principle},
  year={1982},
  journal={Int. J. Theor. Phys.},
  volume={21},
  pages={633--663},
  doi={10.1007/BF02650231},
}

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RIS Citation

TY  - CPAPER
ID  - ca04220f
AU  - Canuto, V. M.
PY  - 1982
TI  - Variable G and the strong equivalence principle
JA  - Int. J. Theor. Phys.
VL  - 21
SP  - 633
EP  - 663
DO  - 10.1007/BF02650231
ER  -

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