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

Phasing ? gravitons

  1. Jul 20, 2008 #1
    "phasing" ? gravitons

    hey everyone, im new here and im wondering if anyone knows whether or not someone already came up with the idea i had a year or two ago, or perhaps if someone knows its impossible and doesnt work. - after reading somewhere that its theorised that gravitons can "phase" or slide between branes into parallell universes, i wondered if gravitons effects could also be projected through a brane, in which case, could dark matter in our observable universe be the effect of gravitys effect being projected into our universe by collections of matter in another universe through a nearby brane?

    i know that will sound pretty sketchy, i have a huge interest in physics but havent yet gone to college or university (i intend to study physics further) and apologise if the wording/and or thought process is overly crude or nonsensical.
  2. jcsd
  3. Jul 22, 2008 #2
    Re: "phasing" ? gravitons

    Dear Hadronhead,

    You should build on your passion for Physics, it is rare and welcome into our community.

    Let me clarify a couple of points for you so that you can make your own mind up on a couple of these issues.

    Firstly, the graviton can indeed go through the branes as you suggested, however the process is quite different to what your thinking (or at least what I think your thinking through what you wrote). String theory assigns to gravitons a closed-loop representation and as such they don't possess ends which are bound on D-branes. Open strings are bound to D-branes and as much as their oscillations can happen in dimensions external to the D-brane itself (like a string attached to a table can come out of the plane of the table) they must remain attached to the brane. It is in this sense that gravity can travel through the bulk of branes.

    Dark matter is quite complex to understand and as you will see in your years of study (and believe me we still struggle) even harder to interpret. The best known candidate for dark matter is the lightest super-neutrino. This is the result of supersymmetry, an extension of the Poincare' algebra to include Spinor generators. The theory predicts the existance of superpartners to those already included in the standard model (see MSSM), the lightest of which could possibly form the Dark matter we currently observe.

    Hope this helps and Good luck with your studies.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook