Supersymmetry and Superparticles

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Discussion Overview

The discussion centers around the concepts of supersymmetry and superparticles within the context of string theory. Participants seek clarification on the properties of these theoretical constructs, particularly regarding the spin characteristics of fermionic strings and their corresponding superparticles.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant requests a refresher on supersymmetry and superparticles, specifically questioning the spin of a superparticle derived from a fermionic string of spin -1/2.
  • Another participant asserts that the theory involves strings with both fermionic and bosonic degrees of freedom, but does not classify elementary objects strictly as fermionic or bosonic.
  • A subsequent post seeks clarification on what is meant by "degrees of freedom" in this context.
  • A participant shares a link to a chart that outlines the relationship between particles, superparticles, and their spins, suggesting it may be useful for understanding the topic.
  • A later post discusses the spin relation between partners and superpartners, noting that the spin of a superpartner is typically -1/2 that of its ordinary partner, with an exception for the higgsino.
  • The same participant expresses curiosity about why the photino could not have a spin of 3/2 instead of 1/2, asking for references or explanations regarding this point.

Areas of Agreement / Disagreement

The discussion reflects multiple competing views and uncertainties regarding the definitions and implications of supersymmetry and superparticles. No consensus has been reached on the specific questions raised.

Contextual Notes

Participants have not fully defined the assumptions underlying their claims, particularly regarding the nature of degrees of freedom and the specific spin characteristics of superparticles. The discussion also relies on external references that have not been critically evaluated within the thread.

DB
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In a nutshell, could someone refresh my memory on supersymmetry and superparticles. I have trouble understanding these subjects of string theory.
Let's say we have a fermonic string of spin -1\2. What is it's superparticle's spin? Is it bosonic?

Thanks to all
 
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The theory has strings with fermionic and bosonic degrees of freedom, that is all. No a elementary object being fermioni or bosonic.
 
arivero said:
The theory has strings with fermionic and bosonic degrees of freedom, that is all. No a elementary object being fermioni or bosonic.
What do you mean by degrees of freedom?
 
supersymmetry

The chart available at the following link should be helpful regarding particles, superparticles, and spin:

http://thinkzone.wlonk.com/Physics/PartHyp.htm
 
Last edited by a moderator:
Thanks, that helps.
 
Partner-superpartner spin relation?

PhysicsFan said:
The chart available at the following link should be helpful regarding particles, superparticles, and spin:

http://thinkzone.wlonk.com/Physics/PartHyp.htm

According to this chart, the spin of a superpartner is always -1/2 the spin of the "ordinary" partner" except for the higgsino which is +1/2 the spin of the higgs.
I aways wondered why the photino couldn't have a spin of 3/2 instead of 1/2, for example.
Any references or explanations to explain why this is?

TIA

Jim Graber
 
Last edited by a moderator:

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