统计力学论题

出版时间:2006-11  出版社:复旦大学出版社  作者:科恩  页数:319  
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前言

  1)avid Goodstem……  路德维希·玻尔兹曼1906年自杀身亡,他毕生的大部分时光都在从事统计力学的研究工作。继续这项工作的保罗’厄仑菲斯同样于1933年自杀身亡。现在轮到我们来研究统计力学了。  也许小心谨慎地接近这一学科才是明智的。  写于States of Matter,1975,纽约:Dover  统计力学与物理学的任何其他分支学科相比,更易受到方法论和表述问题的困扰。哲学家对概率的含义争论不休,尤其是对单一“事件”应用概率时尤甚。数学家则用回避物理解释的方法躲过了这一问题,他们只是简单地把概率作为由一系列规则所限定的“测量”。不过以这种方式脱离实际就不太适用于物理学了。对物理学家而言,概率和统计方法一直使他们非常苦恼。统计方法是造成玻尔兹曼自杀的因素之一,保罗·厄仑菲斯的自杀也可能出于这个原因。即使到了今天,量子力学中猜不透的谜也在于核心部位的概率在作祟。  统计力学中,数学家的操作方法是同E.T.Jaynts True的信息论方法相似的,这种方法经过几代杰出教育家的拼搏,已近完美,不过我承认这种方法并没有特别吸引人之处。当然这种方法或许只是得到结果的一种权宜之计,但是就我内心深处而言,还只是模糊的理解而已。真正理解是物理学家殚思竭虑的目标。相比之下,T.L.Hill等学者的系综形式不但非常清晰而且物理含义明确。有人或许发现系综太形式化了,我却认为它十分迷人。

内容概要

伦敦地区的几所大学,在硕士研究生的最后一年,都要联合起来,通过网络教育的方式,给硕士生讲授几门统一的高级课程,本书就是其中的教程之一。本门教程在成书之前,作者已经系统地讲授了十多年,成书过程中又组织学生、同行和由出版社委派的专家一道,对书稿提出许多建议,然后再修改而成现在这个样子。    全书用一种统一的观点处理热力学和统计物理论题。第一、第二章分别讲述统计力学的方法论和理想体系的实际计算。其中差不多有一半内容属于本科期间已有的基础知识,但采用更高的、完全用统一的观点,看待热力学和统计力学。第三章非理想气体,重点讲述维里展开、配分函数、节流和状态方程。第四章相变,介绍相图、对称性、序参量、临界指数、标度理论、一级相变、二级相变、伊辛模型、朗道理论、铁电体、二元混合物、量子相变、平均场理论等等。这是全书的重点。第五章讲述涨落和动力学行为,重点是涨落的关联特性、布朗运动、朗之万方程和线性响应理论。各章末尾都安排一定数量的习题,习题解答可通过http://www.worldscibooks.com/physics/p365.htm/.取得。  书后还有4个附录,便于读者应用时查取。

作者简介

Brian Cowan,物理学教授,伦敦大学皇家Holloway学院物理系系主任。毕业于英国Sussex大学物理系,曾先后就职于诺丁汉(Nottingham)大学和巴黎(Paris)大学,致力于核磁共振(NMR)的理论和实验研究,著有NuclearMagnetic Resoˉnance and Relaxation(Cambridge Univers

书籍目录

Preface1 The Methodology of Statistical Mechanics 1.1 Terminology and Methodology  1.1.1 Approaches to the subject  1.1.2 Description of states  1.1.3 Extensivity and the thermodynamic limit  1.2 The Fundamental Principles  1.2.1 The laws of thermodynamics  1.2.2 Probabilistic interpretation of the First Law  1.2.3 Microscopic basis for entropy 1.3 Interactions —The Conditions for Equilibrium   1.3.1 Thermal interaction—Temperature  1.3.2 Volume change—Pressure  1.3.3 Particle interchange—Chemical potential   1.3.4 Thermal interaction with the rest of the world—The Boltzmann factor  1.3.5 Particle and energy exchange with the rest of the world —The Gibbs factor 1.4 Thermodynamic Averages  1.4.1 The partition function  1.4.2 Generalised expression for entropy  1.4.3 Free energy  1.4.4 Thermodynamic variables  1.4.5 Fluctuations  1.4.6 The grand partition function  1.4.7 The grand potential  1.4.8 Thermodynamic variables 1.5 Quantum Distributions  1.5.1 Bosons and fermions  1.5.2 Grand potential for identical particles  1.5.3 The Fermi distribution  1.5.4 The Bose distribution  1.5.5 The classical limit—The Maxwell distributior 1.6 Classical Statistical Mechanics  1.6.1 Phase space and classical states  1.6.2 Boltzmann and Gibbs phase spaces  1.6.3 The Fundamental Postulate in the classical case  1.6.4 The classical partition function  1.6.5 The equipartition theorem  1.6.6 Consequences of equipartition  1.6.7 Liouville's theorem  1.6.8 Boltzmann's H theorem 1.7 The Third Law of Thermodynamics  1.7.1 History of the Third Law  1.7.2 Entropy  1.7.3 Quantum viewpoint  1.7.4 Unattainability of absolute zero  1.7.5 Heat capacity at low temperatures  1.7.6 Other consequences of the Third Law  1.7.7 Pessimist's statement of the laws of thermodynamics2 Practical Calculations with Ideal Systems 2.1 The Density of States  2.1.1 Non-interacting systems  2.1.2 Converting sums to integrals  2.1.3 Enumeration of states  2.1.4 Counting states  2.1.5 General expression for the density of states   2.1.6 General relation between pressure and energy 2.2 Identical Particles  2.2.1 Indistinguishability  2.2.2 Classical approximation 2.3 Ideal Classical Gas   2.3.1 Quantum approach   2.3.2 Classical approach   2.3.3 Thermodynamic properties   2.3.4 The l/N! term in the partition function   2.3.5 Entropy of mixing  2.4 Ideal Fermi Gas   2.4.0 Methodology for quantum gases   2.4.1 Fermi gas at zero temperature   2.4.2 Fermi gas at low temperatures—simple model   2.4.3 Fermi gas at low temperatures—series expansion    Chemical potential    Internal energy    Thermal capacity   2.4.4 More general treatment of low temperature heat capacity   2.4.5 High temperature behaviour—the classical limit 2.5 Ideal Bose Gas   2.5.1 General procedure for treating the Bose gas   2.5.2 Number of particles—chemical potential   2.5.3 Low temperature behaviour of Bose gas   2.5.4 Thermal capacity of Bose gas—below Tc   2.5.5 Comparison with superfluid4 He and other systems   2.5.6 Two-fluid model of superfluid 4He   2.5.7 Elementary excitations  2.6 Black Body Radiation—The Photon Gas   2.6.1 Photons as quantised electromagnetic waves   2.6.2 Photons in thermal equilibrium—black body radiation   2.6.3 Planck's formula   2.6.4 Internal energy and heat capacity   2.6.5 Black body radiation in one dimension  2.7 Ideal Paramagnet   2.7.1 Partition function and free energy   2.7.2 Thermodynamic properties   2.7.3 Negative temperatures   2.7.4 Thermodynamics of negative temperatures 3 Non-Ideal Gases 3.1 Statistical Mechanics  3.1.1 The partition function  3.1.2 Cluster expansion  3.1.3 Low density approximation  3.1.4 Equation of state   3.2 The Virial Expansion  3.2.1 Virial coefficients  3.2.2 Hard core potential  3.2.3 Square-well potential  3.2.4 Lennard-Jones potential  3.2.5 Second virial coefficient for Bose and Fermi gas 3.3 Thermodynamics  3.3.1 Throttling  3.3.2 Joule-Thomson coefficient  3.3.3 Connection with the second virial coefficient..  3.3.4 Inversion temperature 3.4 Van der Waals Equation of State  3.4.1 Approximating the partition function  3.4.2 Van der Waals equation  3.4.3 Microscopic "derivation" of parameters  3.4.4 Virial expansion 3.5 Other Phenomenological Equations of State  3.5.1 The Dieterici equation  3.5.2 Virial expansion  3.5.3 The Berthelot equation4 Phase Transitions 4.1 Phenomenology  4.1.1 Basic ideas  4.1.2 Phase diagrams  4.1.3 Symmetry  4.1.4 Order of phase transitions  4.1.5 The order parameter  4.1.6 Conserved and non-conserved order parameters  4.1.7 Critical exponents  4.1.8 Scaling theory  4.1.9 Scaling of the free energy 4.2 First-Order Transition—An Example   4.2.1 Coexistence   4.2.2 Van der Waals fluid   4.2.3 The Maxwell construction   4.2.4 The critical point   4.2.5 Corresponding states  4.2.6 Dieterici's equation  4.2.7 Quantum mechanical effects  4.3 Second-Order Transition—An Example   4.3.1 The ferromagnet   4.3.2 The Weiss model   4.3.3 Spontaneous magnetisation   4.3.4 Critical behaviour   4.3.5 Magnetic susceptibility   4.3.6 Goldstone modes  4.4 The Ising and Other Models  4.4.1 Ubiquity of the Ising model   4.4.2 Magnetic case of the Ising model   4.4.3 Ising model in one dimension   4.4.4 Ising model in two dimensions   4.4.5 Mean field critical exponents   4.4.6 The XY model   4.4.7 The spherical model  4.5 Landau Treatment of Phase Transitions   4.5.1 Landau free energy   4.5.2 Landau free energy for the ferromagnet   4.5.3 Landau theory—second-order transitions  4.5.4 Thermal capacity in the Landau model   4.5.5 Ferromagnet in a magnetic field  4.6 Ferroelectricity   4.6.1 Description of the phenomenon   4.6.2 Landau free energy   4.6.3 Second-order case   4.6.4 First-order case   4.6.5 Entropy and latent heat at the transition   4.6.6 Soft modes  4.7 Binary Mixtures   4.7.1 Basic ideas   4.7.2 Model calculation   4.7.3 System energy   4.7.4 Entropy   4.7.5 Free energy   4.7.6 Phase separation—the lever rule   4.7.7 Phase separation curve—the binodal   4.7.8 The spinodal curve   4.7.9 Entropy in the ordered phase   4.7.10 Thermal capacity in the ordered phase   4.7.11 Order of the transition and the critical point   4.7.12 The critical exponent β  4.8 Quantum Phase Transitions   4.8.1 Introduction   4.8.2 The transverse Ising model   4.8.3 Revision of mean field Ising model   4.8.4 Application of a transverse field   4.8.5 Transition temperature   4.8.6 Quantum critical behaviour   4.8.7 Dimensionality and critical exponents  4.9 Retrospective   4.9.1 The existence of order   4.9.2 Validity of mean field theory   4.9.3 Features of different phase transition models 5 Fluctuations and Dynamics  5.1 Fluctuations   5.1.1 Probability distribution functions   5.1.2 Mean behaviour of fluctuations   5.1.3 The autocorrelation function   5.1.4 The correlation time  5.2 Brownian Motion   5.2.1 Kinematics of a Brownian particle   5.2.2 Short time limit   5.2.3 Long time limit  5.3 Langevin's Equation   5.3.1 Introduction   5.3.2 Separation of forces   5.3.3 The Langevin equation   5.3.4 Mean square velocity and equipartition   5.3.5 Velocity autocorrelation function   5.3.6 Electrical analogue of the Langevin equation  5.4 Linear Response—Phenomenology   5.4.1 Definitions   5.4.2 Response to a sinusoidal excitation   5.4.3 Fourier representation   5.4.4 Response to a step excitation   5.4.5 Response to a delta function excitation   5.4.6 Consequence of the reality of X(t)   5.4.7 Consequence of causality   5.4.8 Energy considerations   5.4.9 Static susceptibility   5.4.10 Relaxation time approximation  5.5 Linear Response—Microscopics   5.5.1 Onsager's hypothesis   5.5.2 Nyquist's theorem   5.5.3 Calculation of the step response function   5.5.4 Calculation of the autocorrelation functionAppendixesAppendix I The Gibbs-Duhem Relation A.1.1 Homogeneity of the fundamental relation  A.1.2 The Euler relation A.1.3 A caveat A.1.4 The Gibbs-Duhem relationAppendix 2 Thermodynamic Potentials A.2.1 Equilibrium states A.2.2 Constant temperature (and volume): the Helmholtz potential A.2.3 Constant pressure and energy: the Enthalpy function A.2.4 Constant pressure and temperature: the Gibbs free energy A.2.5 Differential expressions for the potentials  A.2.6 Natural variables and the Maxwell relations Appendix 3 Mathematica Notebooks A.3.1 Chemical potential of Fermi gas at low temperatures A.3.2 Internal energy of the Fermi gas at low temperatures A.3.3 Fugacity of the ideal gas at high temperatures—Fermi, Maxwell and Bose cases A.3.4 Internal energy of the ideal gas at high temperatures—Fermi, Maxwell and Bose casesAppendix 4 Evaluation of the Correlation Function Integral A.4.1 Initial domain of integration A.4.2 Transformation of variables A.4.3 Jacobian of the transformationIndex

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