Variation of the Gravitational Constant, G, and the Age of the Sun in the BransDicke Cosmology
Abstract
The present position of the sun in the HR diagram is compared with isochrones of three and five billion years, and with M = 1 solar mass models in order to derive a value for the rate of decrease in the gravitational constant G over time according to the BransDicke (1961) cosmological theory with omega = 2. Through a series of calculations it is shown that since the sun cannot be as young as 5 x 10 to the 9th years, the BransDicke model does not apply, at least for such small values of omega. It is demonstrated that the gravitational constant G decreases at a rate of less than G dot/G = 2 x 10 to the 11th per year if the mass of the model remains constant.
 Publication:

Bulletin of the Astronomical Institutes of Czechoslovakia
 Pub Date:
 August 1984
 Bibcode:
 1984BAICz..35..220P
 Keywords:

 Cosmology;
 Gravitational Constant;
 Stellar Evolution;
 Sun;
 Stellar Models;
 Sunspots;
 Solar Physics