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Preface xiii
Notation xv
Background, Mechanics and Statistical Mechanics 1
Background 1
The Mechanical Description of a System of Particles 3
Phase space and equations of motion 7
In equilibrium 7
In a non-isolated system 9
Newton's equations in operator form 10
The Liouville equation 11
Liouville equation in an isolated system 11
Expressions for equilibrium thermodynamic and linear transport properties 11
Liouville equation in a non-isolated system 12
Non-equilibrium distribution function and correlation functions 13
Other approaches to non-equilibrium 15
Projection operators 15
Summary 16
Conclusions 18
References 18
The Equation of Motion for a Typical Particle at Equilibrium: The Mori-Zwanzig Approach 21
The Projection Operator 21
The Generalised Langevin Equation 23
The Generalised Langevin Equation in Terms of the Velocity 26
Equation of Motion for the Velocity Autocorrelation Function 28
The Langevin Equation Derived from theMori Approach: The Brownian Limit 29
Generalisation to any Set of Dynamical Variables 30
Memory Functions Derivation of Expressions for Linear Transport Coefficients 33
Correlation Function Expression for the Coefficient of Newtonian Viscosity 34
Summary 38
Conclusions 39
References 39
Approximate Methods to Calculate Correlation Functions and Mori-Zwanzig Memory Functions 41
Taylor Series Expansion 41
Spectra 43
Mori's Continued Fraction Method 44
Use of Information Theory 46
Perturbation Theories 48
Mode Coupling Theory 51
Macroscopic Hydrodynamic Theory 52
Memory Functions Calculated by the Molecular-Dynamics Method 56
Conclusions 57
References 57
The Generalised Langevin Equation in Non-Equilibrium 61
Derivation of Generalised Langevin Equation in Non-Equilibrium 62
Langevin Equation for a Single Brownian Particle in a Shearing Fluid 66
Conclusions 69
References 69
The Langevin Equation and the Brownian Limit 71
A Dilute Suspension - One Large Particle in a Background 72
Exact equations of motion for A(t) 75
Langevin equation for A(t) 77
Langevin equation for velocity 80
Many-body Langevin Equation 83
Exact equations of motion for A(t) 87
Many-body Langevin equation for A(t) 89
Many-body Langevin equation for velocity 90
Langevin equation for the velocity and the form of the friction coefficients 92
Generalisation to Non-Equilibrium 94
The Fokker-Planck Equation and the Diffusive Limit 95
Approach to the Brownian Limit and Limitations 97
A basic limitation of the LE and FP equations 98
The friction coefficient 98
Self-diffusion coefficient (D[subscript s]) 99
The intermediate scattering function F(q,t) 102
Systems in a shear field 102
Summary 104
Conclusions 104
References 105
Langevin and Generalised Langevin Dynamics 107
Extensions of the GLE to Collections of Particles 107
Numerical Solution of the Langevin Equation 110
Gaussian random variables 111
A BD algorithm to first-order in [Delta]t 113
A second first-order BD algorithm 116
A third first-order BD algorithm 118
The BD algorithm in the diffusive limit 120
Higher-Order BD Schemes for the Langevin Equation 120
Generalised Langevin Equation 121
The method of Berkowitz, Morgan and McCammon 122
The method of Ermak and Buckholz 123
The method of Ciccotti and Ryckaert 125
Other methods of solving the GLE 126
Systems in an External Field 127
Boundary Conditions in Simulations 128
PBC in equilibrium 128
PBC in a shear field 129
PBC in elongational flow 129
Conclusions 131
References 131
Brownian Dynamics 133
Fundamentals 133
Calculation of Hydrodynamic Interactions 135
Alternative Approaches to Treat Hydrodynamic Interactions 137
The lattice Boltzmann approach 138
Dissipative particle dynamics 138
Brownian Dynamics Algorithms 138
The algorithm of Ermak and McCammon 138
Approximate BD schemes 142
Brownian Dynamics in a Shear Field 146
Limitations of the BD Method 148
Alternatives to BD Simulations 149
Lattice Boltzmann approach 149
Dissipative particle dynamics 150
Conclusions 152
References 153
Polymer Dynamics 157
Toxvaerd Approach 159
Direct Use of Brownian Dynamics 160
Rigid Systems 163
Conclusions 166
References 166
Theories Based on Distribution Functions, Master Equations and Stochastic Equations 169
Fokker-Planck Equation 170
The Diffusive Limit and the Smoluchowski Equation 171
Solution of the n-body Smoluchowski equation 173
Position-only Langevin equation 174
Quantum Monte Carlo Method 176
Master Equations 180
The identification of elementary processes 184
Kinetic MC and master equations 186
KMC procedure with continuum solids 187
Conclusions 189
References 191
An Overview 197
Expressions for Equilibrium Properties, Transport Coefficients and Scattering Functions 201
Equilibrium Properties 201
Expressions for Linear Transport Coefficients 202
Scattering Functions 204
Static structure 204
Dynamic scattering 204
References 206
Some Basic Results About Operators 209
Proofs Required for the GLE for a Selected Particle 213
The Langevin Equation from the Mori-Zwanzig Approach 217
The Friction Coefficient and Friction Factor 221
Mori Coefficients for a Two-Component System 223
Basics 223
Short Time Expansions 224
Relative Initial Behaviour of c(t) 224
Time-Reversal Symmetry of Non-Equilibrium Correlation Functions 225
References 227
Some Proofs Needed for the Albers, Deutch and Oppenheim Treatment 229
A Proof Needed for the Deutch and Oppenheim Treatment 233
The Calculation of the Bulk Properties of Colloids and Polymers 235
Equilibrium Properties 235
Static Structure 235
Time Correlation Functions 236
Self-diffusion 236
Time-dependent scattering 236
Bulk stress 237
Zero time (high frequency) results in the diffusive limit 237
References 239
Monte Carlo Methods 241
Metropolis Monte Carlo Technique 241
An MC Routine 243
References 248
The Generation of Random Numbers 249
Generation of Random Deviates for BD Simulations 249
References 250
Hydrodynamic Interaction Tensors 251
The Oseen Tensor for Two Bodies 251
The Rotne-Prager Tensor for Two Bodies 251
The Series Result of Jones and Burfield for Two Bodies 251
Mazur and Van Saarloos Results for Three Bodies 252
Results of Lubrication Theory 252
The Rotne-Prager Tensor in Periodic Boundary Conditions 253
References 253
Calculation of Hydrodynamic Interaction Tensors 255
References 259
Some Fortran Programs 261
Index 301
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