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

Gravitons moving out of our dimension

  1. Mar 5, 2010 #1

    mim

    User Avatar

    Is my understanding correct. Gravity is a week force because gravitons escape out of our dimension into other dimensions. If so would gravitons not also be able to re-enter our dimesion. Therefore cancelling out this theory
     
  2. jcsd
  3. Mar 5, 2010 #2
    Smart.If gravitons are virtual photons, you can think of switching on a bulb.If light travelled in only one selective dimension after re-entering from everywhere else, then we wouldn't need to create lasers
     
  4. Mar 5, 2010 #3

    bapowell

    User Avatar
    Science Advisor

    No, it's just that gravity has more ground to cover. If you imagine that all the forces should be of roughly equal strength, but that electromagnetism and the nuclear forces only operate in our 3 spatial dimensions while gravity must contend with 9 dimensions, you can easily see how it gets "spread out" and diluted.
     
  5. Mar 5, 2010 #4

    mim

    User Avatar

    Many thanks bapowell I get it.
     
  6. Mar 5, 2010 #5

    mim

    User Avatar

    I don't understand your answer vin300. I thought a graviton was a closed string that was shaped or vibrated in a particular way that made it unique ie a graviton also my understanding of the theory was that only gravitons could pass through a brane. We could therefore still do with lasers
     
  7. Mar 5, 2010 #6
    A clarification question: This "diluting" only happens in theories where our universe is actually just a 3 spatial brane in a higher dimensional world, as opposed to a 9 spatial dimension universe with 6 curled up, Correct?

    If not, I'm having trouble seeing how light and other interactions can avoid the curled dimensions.
    If yes, then it seems like if our 3 spatial brane is curved in the higher dimensions, that the gravitons leaking out could hit back on the brane elsewhere ... therefore causing what appears to be "more gravity from nothing". Or is there something which prevents gravitons from "leaking in", and they can only "leak out"?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook