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- Path Integrals in Quantum Mechanics, Statistics, and Polymer Physics
- Duru-Kleinert Transformation for Exact Solution of Path Integrals
- Feynman-Kleinert Variational Approach (see notes on collaboration here)
- Disorder Field Theory of Phase Transitions
- Dual Theory of Superconductivity
- Five-Loop Calculation of Critical Exponents in 4-epsilon Dimensions
- Strong-Coupling Theory of Critical Behavior (more here)
- Kleinert Criterion for Onset of Phase Decoherence
- Variational Perturbation Theory for Field Theory with Anomalous Dimensions turning Divergent Weak-Coupling to Convergent Strong-Couling Expansions
- Vortex Gauge Field Theory of Superfluid Phase Transition
- Defect Gauge Field Theory of Crystal Melting
- Monopole Gauge Field Theory of Confinement
- Collective Quantum Fields in Superconductors and Superfluid He3
- Hadronization of Quark Theories
- Polyakov-Kleinert Stiff String
- Pressure Constant for Stacks of Membranes
- Most Accurate Specific Heat Exponent alpha of Superfluid Helium
- Algebra of Regge Couplings
- Group Dynamics of Hydrogen Atom [the group O(4,2)]
- Supersymmetry in Nuclear Physics
- New Stochastic Calculus for Non-Gaussian Processes
- Financial Markets---Option Pricing for Non-Gaussian Price Fluctuations