Recent Progress in Many-Body Theories

Mean-field approximations to the many-body S-matrix.- Quantum mean-field theory of collective dynamics and tunneling.- Modern theories of irreversible phenomena and entropy; Some applications to nuclear physics.- Non trivial Hartree-Fock studies in the thermodynamic limit.- Nuclear forces and nuclear matter including pions and isobars.- Recent developments in the bonn potential and its application in nuclear matter.- Search for basic properties of the nucleon-nucleon interaction.- Relativistic quantum field approach to nuclear matter and nuclei.- Path integrals, boson expansions and mean field approximations.- Applications of generalized holstein-primakoff transformations to problems of nuclear collective motion.- Theory of metal surfaces: Variational calculation using a correlated wave function.- Many-body effects in the optical properties of quasi-two dimensional systems.- Non-local effects in the electromagnetic properties of interfaces.- Calculation of the coefficients of the nuclear mass formula.- Coupled clusters and coulomb correlations.- Calculation of gaps of superconductors by Coupled Cluster Methods (CCM).- Correlated Bcs theory.- Microscopic Parameters for Superconductivity.- Phonons in superconducting Pd-H(D) alloys using the coherent potential approximation with off-diagonal disorder.- Recent progress in the understanding of strongly coupled coulomb systems.- The perturbation theory approach to the ground state energy in an infinite fermion system.- Brueckner-bethe calculations of nuclear matter.- Coupled Cluster Description of Relativistic Many Body Systems.- Variational matrix pade approximants applied to few body problems.- Nuclear matter and nuclear hamiltonian.- Excitations and transport in quantum liquids.- Quasiparticle properties in nuclear matter.- New approaches to the study of collective excitations in strongly-interacting fermi systems.- Impurity quasiparticle as a weak inhomogeneity.- Effective free energy for nonlinear dynamics.- Green's function monte carlo and the many-fermion problem.- The stochastic solution of the many-body Schroedinger equation for fermions.- Recent developments and future prospects in CBF theory.- Optimal Jastrow correlations for Fermi liquids.- CBF perturbation corrections to the Jastrow ground-state of the electron gas.- Correlations in bose fluids.- Model hamiltonian for superfluidity.- Consequences of defects on lattice vibrations semiclassical theory.- Spin-alignment in condensed atomic hydrogen.- The born-green-yvon theory of fermion quantum fluids.- Statistical theories of large atoms and molecules.- Electrons, phonons and the optical properties of small metallic particles.- Atomic exchange energy as a density functional.- Liouvillian propagator technique for perturbed wave functions, level shifts and broadenings of composite particles in a many-body medium.- Density functionals from models of the electronic charge density.- Effective hamiltonian theory: Recent formal results and non-nuclear applications.- Applications of moment methods to finite nuclei.- Variational calculations on light nuclei.- Study of light nuclei from 4He to 40Ca with the faht cluster expansion.- Three-body forces in nuclei.- Role of isobars in nuclear independent particle motion.- Hyperons in nuclear matter -- an impurity problem.- Pion condensation, equation of state of dense matter and neutron stars.- Structure of baryonic system with pion condensation and its implication in neutron star problems.- Nucleon superfluidity under pion condensation.- Spin-isospin order: critical density in nuclear matterand a possible realization in nuclei.- Group theory and collective degrees of freedom in nuclear many body systems.- List of Papers not contained in the Proceedings.