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Flipped SU(5) : ウィキペディア英語版
Flipped SU(5)
The Flipped SU(5) model is a Grand Unified Theory (GUT) theory first contemplated by Stephen Barr in 1982,〔Barr SM. Phys.Lett. B 112 (1982) 219〕 and by Dimitri Nanopoulos and others in 1984.〔Derendinger JP, Kim JE, and Nanopoulos DV. Phys.Lett. B 139 (1984) 170〕〔Stenger, Victor J., ''Quantum Gods: Creation, Chaos and the Search for Cosmic Consciouness'', Prometheus Books (2009) ISBN 978-1-59102-713-3 p 61.〕 Ignatios Antoniadis, John Ellis, John Hagelin, and Nanopoulos developed the supersymmetric flipped SU(5), derived from the deeper-level superstring.〔Freedman DH. "The new theory of everything", ''Discover'', 1991, pp 54–61.〕
Current efforts to explain the theoretical underpinnings for observed neutrino masses are being developed in the context of supersymmetric flipped .〔Rizos J and Tamvakis K. Hierarchical Neutrino Masses and Mixing in Flipped-. arXiv.org > hep-ph > arXiv:0912.3997v1 (Dec. 20, 2009)〕
Flipped is not a fully unified model, because the factor of the SM gauge group is within the factor of the GUT group. The addition of states below ''M''x in this model, while solving certain threshold correction issues in string theory, makes the model merely descriptive, rather than predictive.〔(Barcow, Timothy et al, ''Electroweak symmetry breaking and new physics at the TeV scale'' World Scientific, 1996 ISBN 978-981-02-2631-2 p 194 )〕
==The model==
The flipped model states that the gauge group is:
:
Fermions form three families, each consisting of the representations
: for the lepton doublet, L, and the up quarks ;
: for the quark doublet, Q, the down quark, and the right-handed neutrino, ;
: for the charged leptons, .
This assignment includes three right-handed neutrinos, which have never been observed, but are often postulated to explain the lightness of the observed neutrinos and neutrino oscillations. There is also a and/or called the Higgs fields which acquire a VEV, yielding the spontaneous symmetry breaking
:
The representations transform under this subgroup as the reducible representation as follows:
:\bar_\to (\bar,1)_}\oplus (1,2)_} (uc and l)
:10_\to (3,2)_}\oplus (\bar,1)_}\oplus (1,1)_0 (q, dc and νc)
:1_\to (1,1)_1 (ec)
:24_0\to (8,1)_0\oplus (1,3)_0\oplus (1,1)_0\oplus (3,2)_}\oplus (\bar,2)_}.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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