# Sparticles: Relationship to supersymmetry and dark matter?

I was attempting to read this paper after watching a show with Brian Greene. As I understand it, sparticles are a prediction of supersymetry, so I was wondering:

• Wouldn't the discovery of supersymmetry lend validity to string theory? Isn't this a testable result, or is this type of supersymmetry predicted by most models?

• As I understand it, sparticles require very high energies to detect. Are they candidates for non-baryonic particles?

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The answer to you first point can be summarized very briefly as: String Theory $\Rightarrow$ Supersymmetry Supersymmetry $\nRightarrow$ String Theory where by $\nRightarrow$ I mean does not necessarily imply. I'm sure that an expert will answer this question much better than I can. –  Kyle Dec 5 '11 at 3:20
@Larian, this is a site for professional physicists to ask questions related to their research. I will therefore direct your question to physics.se where it can be sharpened and get a good answer. –  user566 Dec 5 '11 at 3:50

## migrated from theoreticalphysics.stackexchange.comDec 5 '11 at 3:52

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Superstring theory requires supersymmetry, but not the other way around. So I wouldn't say that the discovery of supersymmetric partner particles would lend validity to string theory. But the alternative (i.e. proving they don't exist, if we had a way to do that) would rule out superstring theory.

There is such a thing as non-supersymmetric string theory, but it doesn't really work - for one thing, it doesn't include any fermions. So that's not really a viable candidate for a theory. Given that, it is fair to say that string theory would be invalid if we could rule out supersymmetry.

And as Bowler said, superpartner particles are potential theoretical candidates for dark matter.

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