## Frontiera E Confini Della Fisica Di Molte ParticelleR. A. Broglia, John Robert Schrieffer, Società italiana di fisica Subjects at the forefront of many-particle research, like high-temperature superconductivity, the quantum Hall effect, heavy fermions, tunneling of quantal systems with many degrees of freedom, Monte Carlo calculations on a lattice etc., were presented. The meeting was well timed as it coincided with a very active period of research in the study of superconductivity and thus provided an excellent opportunity to assess some of the major developments that have taken place in the last years. |

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Page 55

To make this parameter a collective coordinate one must construct a Hamil-

task is to define momentum. Given a wave function with a smooth dependence

on the ...

To make this parameter a collective coordinate one must construct a Hamil-

**tonian**that has a kinetic-energy term with a conjugate momentum. So the nexttask is to define momentum. Given a wave function with a smooth dependence

on the ...

Page 68

We now consider the various treatments of collective tunneling and compare with

the diagonalization of the spin barrier Hamil-

can be extracted from the Hamiltonian is the splitting of the states of opposite ...

We now consider the various treatments of collective tunneling and compare with

the diagonalization of the spin barrier Hamil-

**tonian**. The physical quantity thatcan be extracted from the Hamiltonian is the splitting of the states of opposite ...

Page 290

Our task, then, is to construct a Hamil-

this « classical » knowledge, and then to use it to predict the intrinsically quantum

behavior of the system. (It is not clear, in advance of this operation, whether the ...

Our task, then, is to construct a Hamil-

**tonian**for the « universe » on the basis ofthis « classical » knowledge, and then to use it to predict the intrinsically quantum

behavior of the system. (It is not clear, in advance of this operation, whether the ...

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### Contents

insula | 1 |

EVB theory such as it is | 14 |

Formal theories of EVB and highT0 superconductivity | 20 |

Copyright | |

21 other sections not shown

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### Common terms and phrases

amplitude angular momentum approximation band barrier behavior calculated charge classical configuration correlation Coulomb coupling cross-section defined deformation degrees of freedom density described dipole discussed dynamics edited effect eigenstates electron equation of motion excitation energy exciton expectation value experimental factor Fermi energy Fermi liquid Fermi surface fermion finite fluctuations gauge given Green's function Gutzwiller Hamiltonian Hartree heavy-ion hole Hubbard model inertia interaction Landau lattice Laughlin Lett limit linear magnetic field mass matrix element mean-field Monte Carlo neutrons nuclear nucleon nucleus obtained orbital oscillator P. W. ANDERSON pairing parameter particle path integral phase Phys physics potential problem quadrupole quantity quantum quasi-particle R. A. BROGLIA relativistic renormalized resonance rotational frequency sect shown in fig simulation single-particle spin spinon superconductivity symmetry temperature term theory tion tonian transition tunnelling variable vector wave function yrast zero