On the Uniqueness of the effective Lagrangian for N= 2 SQCD

The low energy effective Lagrangian for N= 2 SU(2) supersymmetric Yang-Mills theory coupled to N_F<4 massless matter fields is derived from the BPS mass formula using asymptotic freedom and assuming that the number of strong coupling singularities is finite.Comment: 16 pages, LaTeX, 2 figures, title changed, sections on central charge and superconformal anomaly extende

Topological Orbifold Models and Quantum Cohomology Rings

We discuss the toplogical sigma model on an orbifold target space. We describe the moduli space of classical minima for computing correlation functions involving twisted operators, and show, through a detailed computation of an orbifold of ${\bf CP}^1$ by the dihedral group $D_{4},$ how to compute the complete ring of observables. Through this procedure, we compute all the rings from dihedral ${\bf CP}^1$ orbifolds; we note a similarity with rings derived from perturbed $D-$series superpotentials of the $A-D-E$ classification of $N = 2$ minimal models. We then consider ${\bf CP}^2/D_4,$ and show how the techniques of topological-anti-topological fusion might be used to compute twist field correlation functions for nonabelian orbifolds.Comment: 48 pages, harvmac, HUTP-92/A06

Duality symmetric string and M-theory

Using holographic methods we investigate the behaviour of fermionic spectral functions of strongly coupled 2+1 dimensional field theories as both temperature and chemical potential are quenched

Combined Research and Curriculum Development of Web-Based

We describe development of modules funded by the National Science Foundation (NSF) program for Combined Research and Curriculum Development (CRCD). Construction of CRCD modules was designed both for research collaboration and educational pedagogy. Modules described here were used for teaching senior level undergraduate and first-year graduate level courses on mechanical behavior of materials that incorporate results of physics-based simulation models previously used by class instructors in their research. These modules were developed using a Java-based Graphical User Interface (GUI) called the Network Program Interface Builder (NPIB) that runs on a standard Web-server. Emphasis was placed on using existing Web-based commercial software and development of new Web-based software that could be used by others to create and maintain physics-based simulation models, and archive results. Strong emphasis was also placed on providing well documented user&apos;s guides so educators and researchers could build their own modules that would extend beyond the CRCD objectives of this project. For the educators and students, Web-access to simulation results allow instructors to monitor students&apos; progress and enhance class participation in sharing and discussing results. As for the researchers NPIB can be used for collaborative development of new simulation models. For students in this project CRCD modules teach the basics of materials mechanical behavior that reflects the experience of the authors. The simulation results span various length scales, starting at the atomistic level, using embedded atom method techniques, and reaching finite element simulations at the continuum level. The modules attempt to stress the way in which macroscopic properties are controlled by phenomena..