## Theoretical physics: an advanced text, Volume 4 |

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### Contents

The density matrix and the statistical operator | 3 |

The statistical distribution in quantum statistics | 7 |

Statistical distributions in an ideal gas | 15 |

Copyright | |

68 other sections not shown

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### Common terms and phrases

angle approximation atoms band behaviour Boltzmann's equation Bose gas calculations chemical potential collision integral components condition confine ourselves constant correlation function corresponding crystal lattice defined density matrix depend diffusion distribution function elec electrical conductivity electron gas entropy equal excitations exciton expression external Fermi surface fluid flux force free electrons frequency gases Hamiltonian Hence ideal gas interaction ions kinetic coefficients kinetic equation Let us consider macroscopic system magnetic field Maxwell distribution mean free path medium metals molecules momenta momentum motion neutrons non-equilibrium number of particles obtain operator pair parameters perturbation phonons plasma potential energy processes properties quantity quantum quantum mechanics quasiparticles radiation field represents scattering semiconductors solution spin Substituting subsystem superfluidity system of electrons taking into account temperature tensor theory thermal thermodynamic tion total number transition trons unit volume velocity wave function wave vector write written