33-7 - One kind of GUT Supersymmetry Many versions of...

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One kind of GUT: Supersymmetry 61 Many versions of string theory require Supersymmetry (SUSY) SUSY assumes every fermion (quarks, leptons) has a boson partner, and every boson (photons, gluons, W/Z) has a fermion partner: superpartners In return we get: nice unification of forces, nice candidate for Dark Matter (next topic) But remember: No direct evidence yet for SUSY ! Since the superpartners of the Standard Model particles have not been observed, supersymmetry, if it exists, must be a broken symmetry, allowing the superparticles to be heavier than the corresponding Standard Model particles. Many physicists think SUSY has too many free parameters and is pursued because it would solve basic physics issues so neatly SUSY must be true – half the predicted particles have been found already! -Ken Young The Higgs boson is consistent with one SUSY version: Minimum SUSY + Standard Model (MSSM)
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Quantizing gravity in a TOE ?
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