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B Why should the four forces be equal in strength?

  1. Jul 17, 2016 #1
    Physicists believe at one time there was only one force. As the BB cooled the four forces we know today are derived from that one force. Why must the four forces all be equal?
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  3. Jul 17, 2016 #2


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    Why do you say they are equal? Gravitation is many orders of magnitude weaker than electromagnetism.
  4. Jul 17, 2016 #3
    This is the problem. Physicists wonder why gravity is so much weaker than the other forces..this implies they think all the forces should be the same
  5. Jul 17, 2016 #4


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    They don't have to be equal, but it looks odd that three are comparable (and, on a dimensionless scale, close to 1), and the fourth one is a factor 10000000000000000000000000000000000000000 weaker than the others. It would be nice to find some reason for that.
  6. Jul 17, 2016 #5
    Perhaps the OP is referring to why in a past epoch the four forces were assumed have been equal.
  7. Jul 17, 2016 #6
    I think mfb is right. The question is why is gravity so weak regardless of the strength of the other forces.
  8. Jul 17, 2016 #7


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    Isn't that because they were super-symmetrical in the early universe?
  9. Jul 18, 2016 #8


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    This has nothing to do with supersymmetry.
  10. Jul 21, 2016 #9
    Because physicists want to unify the forces. Who knows if this is actually possible. If all the forces come together at some point, then they ought to approach the same strength as they approach that point.
  11. Jul 21, 2016 #10
    Why is gravity considered a force? Gravity appears to be emergent and a consequence of space~time interaction. As mass and space interact what appears to be gravity is the action of mass slowing time in space... I think this is Einstein's theories interpretation.
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