While research has indicated that the constants are constants, there are some recent suggestions otherwise cosmicly, and the fact that a even a physicist of the first rank such as Dirac could consider the possibility very seriously should indicate that idea should not so scornfully be dismissed, that such scorn better reflects upon the misfiring of neurons or such in the scorner rather than scornee.
Physics changelings?
While research has indicated that the constants are constants, there are some recent suggestions otherwise cosmicly, and the fact that a even a physicist of the first rank such as Dirac could consider the possibility very seriously should indicate that idea should not so scornfully be dismissed, that such scorn better reflects upon the misfiring of neurons or such in the scorner rather than scornee.
So because Dirac speculatively threw out the idea G might change, we can propose any physical law might change any constant in a completely free, and like, uninhibited way.
And, of course, we're not doing this to understand the universe, as Dirac was, we're doing it to argue against all the evidence that a 4.7 billion year old earth is actually 6000 years old, to fit the cosmology of some 3000 year old near-eastern sheep-herders.