Hamburg 2016 – scientific programme

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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 4: Symposium Quantentheorie und Gravitation

MP 4.3: Invited Talk

Wednesday, March 2, 2016, 14:50–15:30, VMP4 Audimax 1

Standard Model Fermions and N=8 Supergravity — •Hermann Nicolai — Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Am Mühlenberg 1, Potsdam-Golm

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, the 48 spin-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, and show how it is related to the conjectured R symmetry K(E10) of M Theory.