## Cargèse Lectures in Theoretical PhysicsCollection of lectures given at the summer school held at Institut d'Etudes Scientifique de Cargèse. |

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### Contents

The response of a system to an external | 1-9 |

Derivations of the random phase approximation | 1-19 |

Highdensity electron gas | 1-26 |

Copyright | |

42 other sections not shown

### Common terms and phrases

analytic approximation assume behavior Bogoliubov boson calculation channel consider contribution correlation corresponding coupling constant cross section decay defined deformed density fluctuation diagrams e(kw electron gas equation example excitation spectrum existence experimental factor Fermi sea Fermi surface fermion field finite formula Fourier transform frequency give given Green's function ground ground-state energy hamiltonian Hartree-Fock high-energy integral Landau Landau theory leptonic limit mass matrix element neutrino neutrons normal nuclear nuclei nucleon number of particles obtained operators oscillator p(kw pair parameter perturbation theory phonon Phys physical plasmon potential propagator properties protons quadrupole quantum numbers quasi-particle Regge poles relation residue resonance result rotational S(kw self-energy shell model shown in Fig single-particle singularities solution spherical spin superconducting temperature test charge theorem tion trajectory unitarity unperturbed vector wave function weak interactions write zero