Non-standard overview on the possible formulation towards a unified model on the lattice is presented. It is based on the generalized gauge theory which is formulated by differential forms and thus expected to fit in a simplicial manifold. We first review suggestive known results towards this direction. As a small step of concrete realization of the program, we propose a lattice Chern-Simons gr...

It is a great pleasure to be here to help celebrate Pran Nath’s 65 birthday. I first met Pran and Dick in 1982 when I came to Northeastern as a post-doc in their group. They had just developed the first supergravity grand unified model in collaboration with Ali Chamseddine and were very keen to know if grand unified theories could be formulated on the lattice. The first hurdle in this quest was...

We construct a compactification of the heterotic string on an orbifold T 6/Z6 leading to the standard model spectrum plus vector–like matter. The standard model gauge group is obtained as an intersection of three SO(10) subgroups of E8. Three families of SO(10) 16-plets are localized at three equivalent fixed points. Gauge coupling unification favours existence of an intermediate GUT which can ...

Starting from astrophysical indications that the fine structure constant might undergo a small time shift, we discuss the implications of such an effect from the point of view of particle physics. Grand unification implies small time shifts for the nucleon mass, the magnetic moment of the nucleon and the Fermi constant as well. The relative change of the nucleon mass is 123 times larger than th...

We show that gauge-mediation and unified-supergravity give sufficiently firm and different predictions for the spectrum of supersymmetric particles to make it possible to discriminate the two scenarios even if the messenger mass is close to the unification scale. 1 According to our present theoretical understanding, the presence of supersymmetric partners of the three generation of fermions has...

We are really measuring the sum of the cross sections vpver+Em and ppvpm. ln, l ~ 0, but since our neutrino spectrum peaks at 500 MeV/c and is down by an order of magnitude by 1500 MeV/c, we expect the contribution of the final states with additional m. 's to be very small. J. Campbell et al. , Phys. Bev. Lett. 30, 385 (1973). More details of the experiment are given by S. J. Barish, Argonne Na...