## Statistical PhysicsA lucid presentation of statistical physics and thermodynamics which develops from the general principles to give a large number of applications of the theory. |

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### Contents

THE NORMAL FERMI LIQUID 1 Elementary exitatfons in a quantum Fermi liquid | 1 |

Interaction of quasiparticles | 8 |

Magnetic susceptibility of a Fermi liquid | 12 |

Copyright | |

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### Common terms and phrases

atoms Bose gas Bose liquid calculate chemical potential coefficient commutation condensate condition constant coordinates correlation function corresponding crystal definition delta function denote dependence derivative determined diagram technique distances electron elementary excitations energy spectrum equation equilibrium expansion expressed in terms external field external lines Fermi gas Fermi liquid Fermi surface ferromagnet finite fluctuations formula Fourier components free energy given gives Green's function half-plane Hamiltonian Heisenberg Hence integrand integration with respect interaction Landau lattice limit linear macroscopic magnetic field magnetic moment magnon matrix elements mean value medium metal momenta motion non-zero number of particles obtain operator pair parameter perturbation theory phase phonon pole problem properties quantum quasi-momentum quasi-particle range replaced result satisfied solution spin Substituting suffixes summation superconductivity superfluid symmetry temperature tensor thermodynamic quantities tion transformation transition variable velocity vertex function volume vortex filament wave function zero