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Quantum Dynamics for Classical Systems
With Applications of the Number Operator

Fabio Bagarello (Author)

9781118370681, Wiley

Hardback, published 7 December 2012

256 pages
23.6 x 16.3 x 1.8 cm, 0.499 kg

Introduces number operators with a focus on the relationship between quantum mechanics and social science

Mathematics is increasingly applied to classical problems in finance, biology, economics, and elsewhere. Quantum Dynamics for Classical Systems describes how quantum tools—the number operator in particular—can be used to create dynamical systems in which the variables are operator-valued functions and whose results explain the presented model. The book presents mathematical results and their applications to concrete systems and discusses the methods used, results obtained, and techniques developed for the proofs of the results.

The central ideas of number operators are illuminated while avoiding excessive technicalities that are unnecessary for understanding and learning the various mathematical applications. The presented dynamical systems address a variety of contexts and offer clear analyses and explanations of concluded results. Additional features in Quantum Dynamics for Classical Systems include:

  • Applications across diverse fields including stock markets and population migration as well as a unique quantum perspective on these classes of models
  • Illustrations of the use of creation and annihilation operators for classical problems
  • Examples of the recent increase in research and literature on the many applications of quantum tools in applied mathematics
  • Clarification on numerous misunderstandings and misnomers while shedding light on new approaches in the field

Quantum Dynamics for Classical Systems is an ideal reference for researchers, professionals, and academics in applied mathematics, economics, physics, biology, and sociology. The book is also excellent for courses in dynamical systems, quantum mechanics, and mathematical models.

Preface xi

Acknowledgments xv

1 Why a Quantum Tool in Classical Contexts? 1

1.1 A First View of (Anti-)Commutation Rules 2

1.2 Our Point of View 4

1.3 Do Not Worry About Heisenberg! 6

1.4 Other Appearances of Quantum Mechanics in Classical Problems 7

1.5 Organization of the Book 8

2 Some Preliminaries 11

2.1 The Bosonic Number Operator 11

2.2 The Fermionic Number Operator 15

2.3 Dynamics for a Quantum System 16

2.4 Heisenberg Uncertainty Principle 26

2.5 Some Perturbation Schemes in Quantum Mechanics 27

2.6 Few Words on States 38

2.7 Getting an Exponential Law from a Hamiltonian 39

2.8 Green’s Function 44

I Systems with Few Actors 47

3 Love Affairs 49

3.1 Introduction and Preliminaries 49

3.2 The First Model 50

3.3 A Love Triangle 61

3.4 Damped Love Affairs 71

3.5 Comparison with Other Strategies 80

4 Migration and Interaction Between Species 81

4.1 Introduction and Preliminaries 82

4.2 A First Model 84

4.3 A Spatial Model 88

4.4 The Role of a Reservoir 100

4.5 Competition Between Populations 103

4.6 Further Comments 105

5 Levels of Welfare: the Role of Reservoirs 109

5.1 The Model 110

5.2 The Small λ Regime 116

5.3 Back to S 121

5.4 Final Comments 125

6 An Interlude: Writing the Hamiltonian 129

6.1 Closed Systems 129

6.2 Open Systems 133

6.3 Generalizations 136

II Systems with Many Actors 139

7 A First Look at Stock Markets 141

7.1 An Introductory Model 142

8 All-in-one Models 151

8.1 The Genesis of the Model 151

8.2 A Two-Traders Model 162

8.3 Many Traders 169

9 Models with An External Field 187

9.1 The Mixed Model 188

9.2 A Time-Dependent Point of View 196

9.3 Final Considerations 206

10 Conclusions 211

10.1 Other Possible Number Operators 211

10.2 What Else? 217

Bibliography 219

Index 225

Subject Areas: Mathematics [PB]
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