Is the LSP the Graviton in Particle Physics?

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SUMMARY

The discussion centers on the relationship between the Lightest Supersymmetric Particle (LSP) and the graviton in particle physics. Participants explore the hypothesis that the LSP could represent the graviton, questioning the implications of mass in this context. It is established that while the LSP is associated with particles that possess mass, the graviton is inherently massless. However, the gravitino, the superpartner of the graviton, may possess mass and could potentially be the LSP in certain theoretical models.

PREREQUISITES
  • Understanding of particle physics concepts, particularly supersymmetry.
  • Familiarity with the properties of massless particles, specifically the graviton.
  • Knowledge of the role of superpartners in particle physics, including the gravitino.
  • Basic grasp of theoretical models in particle physics.
NEXT STEPS
  • Research the implications of supersymmetry in particle physics.
  • Study the properties and significance of the graviton and gravitino.
  • Explore theoretical models that incorporate the LSP and its relationship with other particles.
  • Learn about the concept of mass in particle physics and its relevance to particle interactions.
USEFUL FOR

Students and enthusiasts of particle physics, theoretical physicists, and anyone interested in the implications of supersymmetry and mass in particle interactions.

AmagicalFishy
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Hey, guys.

I'm going to start off by saying I know near nothing regarding physics and don't claim to be more than completely ignorant in anything passed the fields considered pre-calculus. I have a huge interest in particle physics, though—and have decided to take a more academically rigerous path to actually learn physics, in depth.

Anyway, my interest in the field compels me to do things like download lectures, and while I can only comprehend about 20% of the things that are over-simplified, I enjoy listening to them anyway (and try to grasp onto the few concepts that I can).

So, that is where this question is coming from. . .

Is it possible that the LSP is the graviton? If everything were to decay down to the LSP, perhaps the graviton doesn't have a super-symmetric particle—and is like the "0" in numbers (with no opposite)?

Or is that an idea that is physically impossible?
 
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When you talk about the LSP, you implicitly are talking about particles with mass. The graviton is massless and therefore is not a part of that.

Now, it turns out that the superpartner of the graviton (the gravitino), does usually have mass and can in some models be the LSP.
 

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