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Computational Physics: Problem Solving with Python

Computational Physics: Problem Solving with Python

          
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About the Book

The use of computation and simulation has become an essential part of the scientific process. Being able to transform a theory into an algorithm requires significant theoretical insight, detailed physical and mathematical understanding, and a working level of competency in programming. This upper-division text provides an unusually broad survey of the topics of modern computational physics from a multidisciplinary, computational science point of view. Its philosophy is rooted in learning by doing (assisted by many model programs), with new scientific materials as well as with the Python programming language. Python has become very popular, particularly for physics education and large scientific projects. It is probably the easiest programming language to learn for beginners, yet is also used for mainstream scientific computing, and has packages for excellent graphics and even symbolic manipulations. The text is designed for an upper-level undergraduate or beginning graduate course and provides the reader with the essential knowledge to understand computational tools and mathematical methods well enough to be successful. As part of the teaching of using computers to solve scientific problems, the reader is encouraged to work through a sample problem stated at the beginning of each chapter or unit, which involves studying the text, writing, debugging and running programs, visualizing the results, and the expressing in words what has been done and what can be concluded. Then there are exercises and problems at the end of each chapter for the reader to work on their own (with model programs given for that purpose).  

Table of Contents:
Dedication V Preface XIX 1 Introduction 1 1.1 Computational Physics and Computational Science 1 1.2 This Book’s Subjects 3 1.3 This Book’s Problems 4 1.4 This Book’s Language: The Python Ecosystem 8 1.5 Python’s Visualization Tools 13 1.6 Plotting Exercises 30 1.7 Python’s Algebraic Tools 31 2 Computing Software Basics 33 2.1 Making Computers Obey 33 2.2 ProgrammingWarmup 35 2.3 Python I/O 39 2.4 Computer Number Representations (Theory) 40 2.5 Problem: Summing Series 51 3 Errors and Uncertainties in Computations 53 3.1 Types of Errors (Theory) 53 3.2 Error in Bessel Functions (Problem) 58 3.3 Experimental Error Investigation 62 3.3.1 Error Assessment 65 4 Monte Carlo: Randomness, Walks, and Decays 69 4.1 Deterministic Randomness 69 4.2 Random Sequences (Theory) 69 4.3 RandomWalks (Problem) 75 4.4 Extension: Protein Folding and Self-Avoiding RandomWalks 79 4.5 Spontaneous Decay (Problem) 80 4.6 Decay Implementation and Visualization 84 5 Differentiation and Integration 85 5.1 Differentiation 85 5.2 Forward Difference (Algorithm) 86 5.3 Central Difference (Algorithm) 87 5.4 Extrapolated Difference (Algorithm) 87 5.5 Error Assessment 88 5.6 Second Derivatives (Problem) 90 5.7 Integration 91 5.8 Quadrature as Box Counting (Math) 91 5.9 Algorithm: Trapezoid Rule 93 5.10 Algorithm: Simpson’s Rule 94 5.11 Integration Error (Assessment) 96 5.12 Algorithm: Gaussian Quadrature 97 5.13 Higher Order Rules (Algorithm) 103 5.14 Monte Carlo Integration by Stone Throwing (Problem) 104 5.15 Mean Value Integration (Theory and Math) 105 5.16 Integration Exercises 106 5.17 Multidimensional Monte Carlo Integration (Problem) 108 5.18 Integrating Rapidly Varying Functions (Problem) 110 5.19 Variance Reduction (Method) 110 5.20 Importance Sampling (Method) 111 5.21 von Neumann Rejection (Method) 111 5.22 Nonuniform Assessment 113 6 Matrix Computing 117 6.1 Problem 3: N–D Newton–Raphson; Two Masses on a String 117 6.2 Why Matrix Computing? 122 6.3 Classes of Matrix Problems (Math) 122 6.4 Python Lists as Arrays 126 6.5 Numerical Python (NumPy) Arrays 127 6.6 Exercise: TestingMatrix Programs 134 7 Trial-and-Error Searching and Data Fitting 141 7.1 Problem 1: A Search for Quantum States in a Box 141 7.2 Algorithm: Trial-and-Error Roots via Bisection 142 7.3 Improved Algorithm: Newton–Raphson Searching 145 7.4 Problem 2: Temperature Dependence ofMagnetization 148 7.5 Problem 3: Fitting An Experimental Spectrum 150 7.6 Problem 4: Fitting Exponential Decay 156 7.7 Least-Squares Fitting (Theory) 158 7.8 Exercises: Fitting Exponential Decay, Heat Flow andHubble’s Law 162 8 Solving Differential Equations: Nonlinear Oscillations 171 8.1 Free Nonlinear Oscillations 171 8.2 Nonlinear Oscillators (Models) 171 8.3 Types of Differential Equations (Math) 173 8.4 Dynamic Form for ODEs (Theory) 175 8.5 ODE Algorithms 177 8.6 Runge–Kutta Rule 178 8.7 Adams–Bashforth–Moulton Predictor–Corrector Rule 183 8.8 Solution for Nonlinear Oscillations (Assessment) 187 8.9 Extensions: Nonlinear Resonances, Beats, Friction 189 8.10 Extension: Time-Dependent Forces 190 9 ODE Applications: Eigenvalues, Scattering, and Projectiles 193 9.1 Problem: Quantum Eigenvalues in Arbitrary Potential 193 9.2 Algorithms: Eigenvalues via ODE Solver + Search 195 9.3 Explorations 203 9.4 Problem: Classical Chaotic Scattering 203 9.5 Problem: Balls Falling Out of the Sky 208 9.6 Theory: Projectile Motion with Drag 208 9.7 Exercises: 2- and 3-Body Planet Orbits and Chaotic Weather 211 10 High-Performance Hardware and Parallel Computers 215 10.1 High-Performance Computers 215 10.2 Memory Hierarchy 216 10.3 The Central Processing Unit 219 10.4 CPU Design: Reduced Instruction Set Processors 220 10.5 CPU Design:Multiple-Core Processors 221 10.6 CPU Design: Vector Processors 222 10.7 Introduction to Parallel Computing 223 10.8 Parallel Semantics (Theory) 224 10.9 Distributed Memory Programming 226 10.10 Parallel Performance 227 10.11 Parallelization Strategies 230 10.12 Practical Aspects of MIMD Message Passing 231 10.13 Scalability 236 10.14 Data Parallelism and Domain Decomposition 239 10.15 Example: The IBM Blue Gene Supercomputers 243 10.16 Exascale Computing via Multinode-Multicore GPUs 245 11 Applied HPC: Optimization, Tuning, and GPU Programming 247 11.1 General Program Optimization 247 11.2 Optimized Matrix Programming with NumPy 251 11.3 Empirical Performance of Hardware 254 11.4 Programming for the Data Cache (Method) 262 11.5 Graphical Processing Units for High Performance Computing 266 11.5.1 The GPU Card 267 11.6 Practical Tips forMulticore and GPU Programming 267 12 Fourier Analysis: Signals and Filters 275 12.1 Fourier Analysis of Nonlinear Oscillations 275 12.2 Fourier Series (Math) 276 12.3 Exercise: Summation of Fourier Series 279 12.4 Fourier Transforms (Theory) 279 12.5 The Discrete Fourier Transform 281 12.6 Filtering Noisy Signals 290 12.7 Noise Reduction via Autocorrelation (Theory) 290 12.7.1 Autocorrelation Function Exercises 293 12.8 Filtering with Transforms (Theory) 294 12.9 The Fast Fourier Transform Algorithm 299 12.10 FFT Implementation 303 12.11 FFT Assessment 304 13 Wavelet and Principal Components Analyses: Nonstationary Signals and Data Compression 307 13.1 Problem: Spectral Analysis of Nonstationary Signals 307 13.2 Wavelet Basics 307 13.3 Wave Packets and Uncertainty Principle (Theory) 309 13.4 Short-Time Fourier Transforms (Math) 311 13.5 TheWavelet Transform 313 13.6 Discrete Wavelet Transforms, Multiresolution Analysis 317 13.7 Principal Components Analysis 332 14 Nonlinear Population Dynamics 339 14.1 Bug Population Dynamics 339 14.2 The Logistic Map (Model) 339 14.3 Properties of NonlinearMaps (Theory and Exercise) 341 14.4 Mapping Implementation 344 14.5 Bifurcation Diagram (Assessment) 345 14.6 Logistic Map Random Numbers (Exploration) 348 14.7 Other Maps (Exploration) 348 14.8 Signals of Chaos: Lyapunov Coefficient and Shannon Entropy 349 14.9 Coupled Predator–PreyModels 353 14.10 Lotka–Volterra Model 354 14.11 Predator–Prey Chaos 356 15 Continuous Nonlinear Dynamics 363 15.1 Chaotic Pendulum 363 15.2 Visualization: Phase-Space Orbits 367 15.3 Exploration: Bifurcations of Chaotic Pendulums 374 15.4 Alternate Problem: The Double Pendulum 375 15.5 Assessment: Fourier/Wavelet Analysis of Chaos 377 15.6 Exploration: Alternate Phase-Space Plots 378 15.7 Further Explorations 379 16 Fractals and Statistical Growth Models 383 16.1 Fractional Dimension (Math) 383 16.2 The Sierpin Gasket (Problem 1) 384 16.3 Growing Plants (Problem 2) 386 16.4 Ballistic Deposition (Problem 3) 390 16.5 Length of British Coastline (Problem 4) 391 16.6 Correlated Growth, Forests, Films (Problem 5) 395 16.7 Globular Cluster (Problem 6) 396 16.8 Fractals in Bifurcation Plot (Problem 7) 400 16.9 Fractals from Cellular Automata 400 16.10 Perlin Noise Adds Realism 402 16.11 Exercises 407 17 Thermodynamic Simulations and Feynman Path Integrals 409 17.1 Magnets via Metropolis Algorithm 409 17.2 An IsingChain (Model) 410 17.3 Statistical Mechanics (Theory) 412 17.4 Metropolis Algorithm 413 17.5 Magnets viaWang–Landau Sampling 420 17.6 Wang–Landau Algorithm 423 17.7 Feynman Path Integral Quantum Mechanics 429 17.8 Feynman’s Space–Time Propagation (Theory) 429 17.9 Exploration: Quantum Bouncer’s Paths 440 18 Molecular Dynamics Simulations 445 18.1 Molecular Dynamics (Theory) 445 18.2 Verlet and Velocity–Verlet Algorithms 451 18.3 1D Implementation and Exercise 453 18.4 Analysis 456 19 PDE Reviewand Electrostatics via Finite Differences and Electrostatics via Finite Differences 461 19.1 PDE Generalities 461 19.2 Electrostatic Potentials 463 19.2.1 Laplace’s Elliptic PDE (Theory) 463 19.3 Fourier Series Solution of a PDE 464 19.4 Finite-Difference Algorithm 467 19.5 Assessment via Surface Plot 471 19.6 Alternate Capacitor Problems 471 19.7 Implementation and Assessment 474 19.8 Electric Field Visualization (Exploration) 475 19.9 Review Exercise 476 20 Heat Flow via Time Stepping 477 20.1 Heat Flow via Time-Stepping (Leapfrog) 477 20.2 The Parabolic Heat Equation (Theory) 478 20.3 Assessment and Visualization 483 20.4 Improved Heat Flow: Crank–Nicolson Method 484 21 Wave Equations I: Strings and Membranes 491 21.1 A Vibrating String 491 21.2 The HyperbolicWave Equation (Theory) 491 21.3 Strings with Friction (Extension) 499 21.4 Strings with Variable Tension and Density 500 21.5 Vibrating Membrane (2DWaves) 504 21.6 Analytical Solution 505 21.7 Numerical Solution for 2DWaves 508 22 Wave Equations II: QuantumPackets and Electromagnetic 511 22.1 Quantum Wave Packets 511 22.2 Time-Dependent Schrödinger Equation (Theory) 511 22.3 Algorithm for the 2D Schrödinger Equation 517 22.4 Wave Packet–Wave Packet Scattering 518 22.5 E&MWaves via Finite-Difference Time Domain 525 22.6 Maxwell’s Equations 525 22.7 FDTD Algorithm 526 22.8 Application:Wave Plates 533 22.9 Algorithm 534 22.10 FDTD Exercise and Assessment 535 23 Electrostatics via Finite Elements 537 23.1 Finite-Element Method 537 23.2 Electric Field from Charge Density (Problem) 538 23.3 Analytic Solution 538 23.4 Finite-Element (Not Difference) Methods, 1D 539 23.5 1D FEMImplementation and Exercises 544 23.6 Extension to 2D Finite Elements 547 24 Shocks Waves and Solitons 555 24.1 Shocks and Solitons in ShallowWater 555 24.2 Theory: Continuity and Advection Equations 556 24.3 Theory: ShockWaves via Burgers’ Equation 559 24.4 Including Dispersion 562 24.5 Shallow-Water Solitons: The KdeV Equation 563 24.6 Solitons on Pendulum Chain 567 25 Fluid Dynamics 575 25.1 River Hydrodynamics 575 25.2 Navier–Stokes Equation (Theory) 576 25.3 2D Flow over a Beam 581 25.4 Theory: Vorticity Form of Navier–Stokes Equation 582 26 Integral Equations of QuantumMechanics 591 26.1 Bound States of Nonlocal Potentials 591 26.2 Momentum–Space Schrödinger Equation (Theory) 592 26.3 Scattering States of Nonlocal Potentials 597 26.4 Lippmann–Schwinger Equation (Theory) 598 Appendix A Codes, Applets, and Animations 607 Bibliography 609 Index 615


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Product Details
  • ISBN-13: 9783527413157
  • Publisher: Wiley-VCH Verlag GmbH
  • Publisher Imprint: Blackwell Verlag GmbH
  • Depth: 32
  • Height: 239 mm
  • No of Pages: 644
  • Series Title: No Longer Used
  • Sub Title: Problem Solving with Python
  • Width: 170 mm
  • ISBN-10: 3527413154
  • Publisher Date: 22 Jul 2015
  • Binding: Paperback
  • Edition: 3 Revised
  • Language: English
  • Returnable: N
  • Spine Width: 33 mm
  • Weight: 1202 gr


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