Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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....
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook