| Hoyle-Narlikar theory | is a kind of cosmology theory |  |
| has definition A reformulation of the general theory of relativity that incorporates and extends Mach's principle (q.v.). In this theory, the inertial mass of a particle is a function of the masses of all other particles, multiplied by a coupling constant which is a function of cosmic epoch. In cosmologies based on this theory, the gravitational constant G decreases strongly with time. |  |
| cosmology theory | has domain cosmology |  |
| theory | has validity correct or incorrect with caveats |  |
| has author or reasearch group |  |
| has date or a range of dates for which the theory was active |  |