Dirac theory over gravitational constant reduction.

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SUMMARY

Dirac's hypothesis posits that the gravitational constant decreases over time, suggesting a relationship between fundamental forces and the universe's age. This speculation arises from the comparison of the electromagnetic force's strength to that of gravity, indicating that as the universe ages, gravity may weaken relative to electromagnetic forces. The proposal is not widely accepted as serious within the scientific community and is primarily a theoretical exploration rather than a validated theory. For further details, refer to the Dirac large numbers hypothesis on Wikipedia.

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Dirac had proposed that Gravitational constant would reduce with time.Why?
 
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If you mean, why did he propose that, I can't say. If you mean, why would the gravitational constant reduce, it might help if you gave a reference to what Dirac actually proposed.
 
PeterDonis said:
If you mean, why did he propose that, I can't say. If you mean, why would the gravitational constant reduce, it might help if you gave a reference to what Dirac actually proposed.

It wasn't a serious proposal. There are some really huge numbers in physics. One of them is the strength of the electromagnetic force between electron and proton compared with the strength of the gravitational force. Another is the age of the universe in Planck units. Dirac just speculated that these numbers were related by some undiscovered law. If they were, then that would imply that as the universe gets older, the strength of gravity weakens (compared to electromagnetic forces).

This is described on this Wikipedia page:
http://en.wikipedia.org/wiki/Dirac_large_numbers_hypothesis
 

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