Is the Earth expanding?

[avandonk]

The cognoscenti say all the four forces were of equal magnitude just after the BB.


Why is gravity so pathetically weak now?

Never mind all the other forces.

Why is the strong force so short range?

Why is the weak force so poofy? beta decay anyone

The electromagnetic force so strong?

bert

[CraigS]

I don't know that I've heard that they were of equal magnitudes just after the BB.

I have read that BBT posits that they were all united, prior.

How could it be established that the magnitudes were equal ?

Anyone know ?

Cheers

[CraigS]

Aha .. Ok … I'll answer my own question …

Wiki: Strongly Symmetric Matter

If the predictions of supersymmetry and more so, string theory are correct then during the time of the Planck Epoch (10⌃-43 seconds after the Big Bang) all four fundamental forces were of equal strength and united into a single fundamental force.

However, shortly thereafter, during the grand unification epoch, (10⌃−33 seconds after the Big Bang), gravity began to separate from the other three forces of electromagnetism, the strong, and weak nuclear force.

After gravity had separated, the strong nuclear force was quick to follow and separated itself from the electroweak force, ending the epoch. The phrase strongly symmetric matter refers to the united forces present during this time.

Supersymmetry makes the difference …

Thanks for the reminder, Bert.

Cheers