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Lisa Croner
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Nambu-Type Generalization of the Dirac Equation
John Lopez
et al.
Jan 16, 1996
Nonlinear generalization of the Dirac equation extending the standardparadigm of nonlinear Hamiltonians is discussed. ``Faster-than-lighttelegraphs" are absent for all theories formulated within the new framework. Anew metric for infinite dimensional Lie algebras associated with Lie-Poissondynamics is introduced.
Quantum Mechanics
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Quantum Mechanics
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Two-Dimensional Chiral Matrix Models and String Theories
Alexey Rybakov
et al.
Nov 3, 1996
We formulate and solve a class of two-dimensional matrix gauge modelsdescribing ensembles of non-folding surfaces covering an oriented, discretized,two-dimensional manifold. We interpret the models as string theoriescharacterized by a set of coupling constants associated to worldsheetramification points of various orders. Our approach is closely related to, butsimpler than, the string theory describing two-dimensional Yang-Mills theory.Using recently developed character expansion methods we exactly solve themodels for target space lattices of arbitrary internal connectivity andtopology.
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Renormalization In Coupled-Abelian Self-Dual Chern-Simons Models
John Lopez
et al.
Nov 7, 1996
An algebraic restriction of the nonabelian self-dual Chern-Simons-Higgssystems leads to coupled-abelian self-dual models with intricate mass spectra.The vacua are characterized by embeddings of SU(2) into the gauge algebra; andin the broken phases, the gauge and real scalar masses are related to theexponents of the gauge algebra. In this paper we compute the gauge-gauge-Higgscouplings in the broken phases and use this to compute the finiterenormalizations of the Chern-Simons coefficient in the various vacua.
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Supersymmetric Grand Unified Theories and Global Fits to Low Energy Data
Manuel Rodrigues
et al.
Nov 13, 1996
We present a self-consistent $\chi^2$ analysis of several supersymmetric(SUSY) grand unified theories recently discussed in the literature. We obtainglobal fits to low energy data, including gauge couplings, fermion masses andmixing angles, gauge boson masses and $BR(b\rightarrow s\gamma)$. One of themodels studied provides an excellent fit to the low energy data with$\chi^2\sim 1$ for 3 degrees of freedom, in a large region of theexperimentally allowed SUSY parameter space. We also discuss the consequencesof our work for a general MSSM analysis at the $Z$ scale.
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