How variable is the gravitational constant

Details How variable is the gravitational constant How variable is the gravitational constant

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976s%26w....15...41w&link_type=abstract

Sterne und Weltraum, vol. 15, Feb. 1976, p. 41-43. In German.

Astronomy and Astrophysics

Astrophysics

Astrophysics, Gravitational Constant, Secular Variations, Earth Rotation, Geophysics, Long Term Effects, Pulsars, Stellar Evolution

Scientific paper

The paper poses the problem of the possibility of a variable gravitational constant G, which lies essentially in the fact that if Mach's principle, which states that the local reference system is determined by the average motion of remote astronomical objects, is to be considered valid, then the notion of an expanding universe implies the variability, in fact, the gradual diminishing of the value of the gravitational constant since the time the universe began. Since a period of about 100,000 years would be required to detect any change in G with laboratory means of current accuracy of measurement, other methods must be used. The paper discusses some of these methods, which include investigation of the lunar motions, precision measurements of the distances to planets, studying the periodicity of pulsars, and analysis of the time scale of stellar evolution. Some geophysical and geological facts bearing on the problem are also briefly examined.

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