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G at small distances

  1. Feb 12, 2010 #1
    Are exist some theories that G is enlarged at very small distances?
    Can you give some links?

  2. jcsd
  3. Feb 13, 2010 #2
    Well G runs but it may well get smaller not larger depending on who you ask...
  4. Feb 13, 2010 #3
    All sorts of theories exist. Experimentally, significant scale-dependent variations in G (dG/G~1) are ruled out down to approx. 0.05 mm.
  5. Feb 13, 2010 #4
    I have NOT read of an increasing G at small distances.

    In some multidimensional theories there is theory that G may leak to other dimensions, even parallel universes, and that that happens even at larger everyday scales...and might be a reason gravity is the weakest of known forces....

    THREE ROADS TO QUANTUM GRAVITY by Lee Smolin is a modern popular non mathematical treatment...meaning three theories...

    to probe gravity at sub microscopic lengths, Smolin feels a background independent framework is required, meaning the space and time must be formulated as dynamical relationships, not like a rigid lattice for example.

    In addition as you approach Planck size, it would appear that everything we know may disappear in quantum foam; length, time, forces become indistinguishable, and hence appear might weaken at near the ultimate microscopic dimensions in the vicinity of
    10-33 cm.
  6. Feb 13, 2010 #5
    I should have also mentioned: we know that quantum mechanics and general relativity encounter irregularities (infinities) in the vicincity of singularities like the big bang and black hole centers..where space and time become incredibly curved/distorted/ and lose some of their everyday characteristics......so either something is wrong with those formulations or something is wrong with each of QM and GR....
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