Superspace parametrized by gauge potentials instead of metric three-geometries is discussed in the context of the Ashtekar variables. Among other things, an " internal clock " for the full theory can… (More)

We discuss a global anomaly associated with the coupling of chiral Weyl fermions to gravity. The Standard Model based upon SU(3)×SU(2)×U(1) which has 15 fermions per generation is shown to be… (More)

We discuss the BRST cohomologies of the invariants associated with the description of classical and quantum gravity in four dimensions, using the Ashtekar variables. These invariants are constructed… (More)

We consider extensions of the Standard Model with an extra U(1) gauge boson which couples to B − (αLe + βLμ + γLτ ) with α + β + γ = 3. We show that the extra gauge boson necessarily mixes with the Z… (More)

We present a generalization of the Frolov-Slavnov invariant regularization scheme for chiral fermion theories in curved spacetimes. The Lagrangian level regularization is explicitly invariant under… (More)

We have analysed dimuon distributions due to the diffractive production of a new hadronic ,vector boson in neutrino scattering. Characteristic features that distinguish this mechanism from heavy… (More)

We compare the conventional description of the interaction of matter with the four known forces in the standard model with an alternative Weyl description in which the chiral coupling is extended to… (More)

We estimate the most important corrections to the branching ratios for the invisible decays of quarkonium states, arising from possible extensions of the Standard Model. Among the possibilities… (More)

The status of the Gerasimov-Drell-Hearn sum rules for polarized inclusive photo-production on nucleons is reviewed. It is shown that results from currently available data compare favorably with an… (More)

Freydoon Mansouri and I first met during the fall of 1970. I was in the second year of my postdoc at the Enrico Fermi Institute at the University of Chicago, and Freydoon was beginning his first… (More)