## Some Aspects of Polaron TheoryThis monograph is an amplification of a set of special lectures delivered by the authors in the Physics Department of Moscow State University. The linear polaron model is studied. It is shown that the system is soluble for arbitrary coupling interaction strength between the electron and lattice vibrations. Detailed calculational techniques for obtaining the correlation, spectral and Green functions are given. The thermodynamic properties of the system are studied within the framework of the functional method. |

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### Contents

Linear Polaron Model | 1 |

Some Preliminary Notes on Calculation Averages from | 31 |

Statistical Equilibrium in the Polaron Theory | 49 |

Determination of Equilibrium Momentum Distribution | 85 |

111 | |

Appendix | 113 |

### Other editions - View all

Some Aspects of Polaron Theory N N Bogolubov,N N Bogolubov <b>Jr.</b> Limited preview - 1988 |

### Common terms and phrases

Ace Q approximation arbitrary averages becomes Bh Bh calculation Chapter Consider constant contains continuous correction correlation corresponding defined definite depend dimensionless disentangle easy electron equal equation example expansion expression field finite Fint follows formula free energy frequency function further given gives hamiltonian Hence integral interaction interval introduce limit limiting process linear momentum mſh Note obtain operator parameters particle particular perform periodic perturbation phonon polaron positive problem procedure properties quadratic quantum real axis reasoning regular relation remark representation represented result right hand side side of Eq situation ſº symmetry T-product T{exp term theory variables variation virtue of Eqs w-HiO write yields zero