tag:blogger.com,1999:blog-7315236707728759521.post1239287465909887718..comments2024-03-27T22:28:06.861-06:00Comments on Dispatches From Turtle Island: N=8 SUGRA Adds Only RH Neutrinos To The Fermion Content Of The Standard ModelAndrew Oh-Willekehttp://www.blogger.com/profile/02537151821869153861noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-7315236707728759521.post-58679322178894907122017-01-27T16:48:55.867-07:002017-01-27T16:48:55.867-07:00From the conclusion:
"What is clear, however...From the conclusion:<br /><br />"What is clear, however, is that in such a scheme the W± and Z vector bosons would have to be composite, in a partial realization of the conjecture already made in [7], that SU(8) becomes dynamical. We recall that the ‘composite’ chiral SU(8) symmetry does not suffer from anomalies [14], and the same should be true for any subgroup of SU(8) that becomes dynamical.<br /><br />The results of this article lend further credence to the remarkable coincidence, already exhibited in [5] and [3],<br />between the fermionic sector of N = 8 supergravity and the observed 48 spin- 1/2 fermions of the Standard Model. <br /><br />Evidently this agreement would be spoilt if any new fundamental spin- 1/2 degrees of freedom (as predicted by all models of N = 1 low energy supersymmetry) were to be found at LHC. While the numerology is thus very suggestive, there remain, of course, the thorny open problems already listed in [3] (huge negative cosmological constant, mass spectrum, etc.), whose resolution would demand some new, and as yet unknown, dynamics which would also have to account for the final breaking of N = 2 supersymmetry.<br /><br />So the above coincidence between theory and observation may yet turn out to be a mirage. At any rate,<br />and in view of the complete absence so far of any ‘new physics’ at LHC, it appears worthwhile to search for unconventional alternatives, of the type considered here, to currently popular ideas. In particular, the actual realization of supersymmetry in particle physics may require a more sophisticated implementation of this beautiful concept than in the N = 1 models currently thought to be phenomenologically viable."andrewhttps://www.blogger.com/profile/08172964121659914379noreply@blogger.comtag:blogger.com,1999:blog-7315236707728759521.post-80429706399004859192017-01-27T16:41:19.802-07:002017-01-27T16:41:19.802-07:00Preprint at https://arxiv.org/abs/1412.1715Preprint at https://arxiv.org/abs/1412.1715andrewhttps://www.blogger.com/profile/08172964121659914379noreply@blogger.comtag:blogger.com,1999:blog-7315236707728759521.post-446513967636696042017-01-27T16:15:34.095-07:002017-01-27T16:15:34.095-07:00Thanks a lot. I appreciate it. The abstract of the...Thanks a lot. I appreciate it. The abstract of the paper you linked and the full citation are as follows:<br /><br />"In a scheme originally proposed by Gell-Mann, and subsequently shown to be realized at the SU(3)×U(1) stationary point of maximal gauged SO(8) supergravity by Warner and one of the present authors, the 48 spin-<br />1/2 fermions of the theory remaining after the removal of eight Goldstinos can be identified with the 48 quarks and leptons (including right-chiral neutrinos) of the Standard model, provided one identifies the residual SU(3) with the diagonal subgroup of the color group SU(3)c and a family symmetry SU(3)f. However, there remained a systematic mismatch in the electric charges by a spurion charge of ± 1/6. We here identify the “missing” U(1) that rectifies this mismatch, and that takes a surprisingly simple, though unexpected form."<br /><br />Krzysztof A. Meissner and Hermann Nicolai, "Standard model fermions and N=8 supergravity", Phys. Rev. D 91, 065029 (24 March 2015).<br /><br />andrewhttps://www.blogger.com/profile/08172964121659914379noreply@blogger.comtag:blogger.com,1999:blog-7315236707728759521.post-21241980338922954692017-01-27T12:59:55.542-07:002017-01-27T12:59:55.542-07:00Hi,
in case you missed it, I just found the sourc...Hi,<br /><br />in case you missed it, I just found the source : http://journals.aps.org/prd/abstract/10.1103/PhysRevD.91.065029Anonymoushttps://www.blogger.com/profile/13835119654701354197noreply@blogger.com