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Dark Matter and supersymmetry

  1. Aug 4, 2008 #1

    I`ve heard that supersymmetry predicts new fundamental particles that may explain dark matter, and that dark matter and dark energy is 95 percent of the total mass of the universe...

    What are these fundamental particles predicted by supersymmetry?, and how can those particles be created ? Is a high energy particle accelerator (like the LHC) requiered to create these particles?

    Thanks for your help
  2. jcsd
  3. Aug 6, 2008 #2
    Be careful dark matter and dark energy are different.
    If I remember well, dark matter is roughtly ~ 22% of universe mass, and dark energy ~ 73%.
    Supersymmetry provide indeed a candidate for "cold" dark matter (heavy matter with low speed).

    usually, because there are plenty of supersymmetry models, the so-called neutralino is dark matter candidate.
    Neutralino is a mixing of gauginos which are superpartners of standard gauge bosons (weak bosons Z,W and Higgs)

    earlier in Universe history, Universe was I guess hot enough such that heavy neutralino could be created in collisions.

    If supersymmetry particles are not too heavy, yes LHC could create them via high energy collision like that could have been in early Universe.
  4. Sep 8, 2008 #3
    The candidate particles for Dark matter are
    1-) Neutralino
    2-) Axino
    3-) Gravitino

    In supersymmetry it is investigated under the subject of Lightest Supersymmetric Particle (LSP) or Next Lightest Supersymmetric Particle (NLSP).
  5. Sep 8, 2008 #4
    Did you mean axion ? If that were a parner of the axion, why would the partner be more likely candidate than the axion itself ?
  6. Sep 8, 2008 #5

    George Jones

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    The axion is a dark matter candidate that thus far is consistent with all experiments, but the original post asked specifically about supersymmetric dark matter candidates.
  7. Sep 8, 2008 #6
    Then the list precisely state "The candidate superparticles for Dark matter are" :biggrin:
    Is the axino supposed to be lighter than the axion ?
  8. Sep 8, 2008 #7
    Why do you think it is supposed to be lighter?

    Lightest Supersymmetric Particle means the lightest in the whole list of Susy particles. Not relative to its superpartner or superpartners.
  9. Sep 8, 2008 #8
    I don't suppose so, I was just wondering, since we already search for the axion. For the axino to be relevant, you need to only supersymmetry, but also the axion itself ! Since we don't find the axion, I thought if the axino is lighter, we have a possibility to discover both supersymmetry directly and the axion indirectly with it. But it was just a passing thought at breakfast :smile:
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