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Full Description
A new edition of a foundational overview of quantum mechanics.
This book presents a concise summary of nonrelativistic quantum mechanics for physics students at the university level. The text covers essential topics, from general mathematical formalism to specific applications. The formulation of quantum theory is explained and supported with illustrations of the general concepts of elementary quantum systems. In addition to traditional topics of nonrelativistic quantum mechanics—including single-particle dynamics, symmetries, semiclassical and perturbative approximations, density-matrix formalism, scattering theory, and the theory of angular momentum—the book also covers modern issues, among them quantum entanglement, decoherence, measurement, nonlocality, and quantum information. The historical context and chronology of basic achievements are also outlined in explanatory notes.
Ideal as a supplement to classroom lectures, A Condensed Course of Quantum Mechanics will also serve as a compact and comprehensible refresher of elementary quantum theory for more advanced students.
Contents
Preface
Rough guide to notation
INTRODUCTION
1. FORMALISM - 2. SIMPLE SYSTEMS
1.1 Space of quantum states
Hilbert space. Rigged Hilbert space
Dirac notation
Sum & product of spaces
2.1 Examples of quantum Hilbert spaces
Single structureless particle with spin 0 or 1
2 distinguishable/indistinguishable particles. Bosons & fermions
Ensembles of N > 2 particles
1.2 Representation of observables
Observables as Hermitian operators. Basic properties
Eigenvalues & eigenvectors in finite & infinite dimension
Discrete & continuous spectrum. Spectral decomposition
2.2 Examples of quantum operators
Spin-1/2 operators
Coordinate & momentum
Hamiltonian of free particle & particle in potential
Orbital angular momentum. Isotropic Hamiltonians
Hamiltonian of a particle in electromagnetic field
1.3 Compatible and incompatible observables
Compatible observables. Complete set
Incompatible observables. Uncertainty relation
Analogy with Poisson brackets
Equivalent representations
2.3 Examples of commuting & noncommuting operators . . .
Coordinate, momentum & associated representations
Angular momentum components
Complete sets of commuting operators for structureless particle
1.4 Representation of physical transformations
Properties of unitary operators
Canonical & symmetry transformations
Basics of group theory
2.4 Fundamental spatio-temporal symmetries
Space translation
Space rotation
Space inversion
Time translation & reversal. Galilean transformations
Symmetry & degeneracy
1.5 Unitary evolution of quantum systems
Nonstationary Schrödinger equation. Flow. Continuity equation.
Conservation laws & symmetries
Energy x time uncertainty. (Non)exponential decay
Hamiltonians depending on time. Dyson series
Schrodinger, Heisenberg & Dirac description
Green operator. Single-particle propagator
2.5 Examples of quantum evolution
Two-level system
Free particle
Coherent states in harmonic oscillator
Spin in rotating magnetic field
1.6 Quantum measurement
State vector reduction & consequences
EPR situation. Interpretation problems
2.6 Implications & applications of quantum measurement . .
Paradoxes of quantum measurement
Applications of quantum measurement
Hidden variables. Bell inequalities. Nonlocality
1.7 Quantum statistical physics
Pure and mixed states. Density operator
Entropy. Canonical ensemble
Wigner distribution function
Density operator for open systems
Evolution of density operator: closed & open systems
2.7 Examples of statistical description
Harmonic oscillator at nonzero temperature
Coherent superposition vs. statistical mixture
Density operator and decoherence for a two-state system . . . .
3. QUANTUM-CLASSICAL CORRESPONDENCE
3.1 Classical limit of quantum mechanics
The limit h -> 0
Ehrenfest theorem. Role of decoherence
3.2 WKB approximation
Classical Hamilton-Jacobi theory
WKB equations & interpretation
Quasiclassical approximation
3.3 Feynman integral
Formulation of quantum mechanics in terms of trajectories
Application to the Aharonov-Bohm effect
Application to the density of states
4. ANGULAR MOMENTUM
4.1 General features of angular momentum
Eigenvalues and ladder operators
Addition of two angular momenta
Addition of three angular momenta
4.2 Irreducible tensor operators
Euler angles. Wigner functions. Rotation group irreps . . .
Spherical tensors. Wigner-Eckart theorem
5. APPROXIMATION TECHNIQUES
5.1 Variational method
Dynamical & stationary variational principle. Ritz method
5.2 Stationary perturbation method
General setup & equations
Nondegenerate case
Degenerate case
Application in atomic physics
Application to level dynamics
Driven systems. Adiabatic approximation
5.3 Nonstationary perturbation method
General formalism
Step perturbation
Exponential & periodic perturbations
Application to stimulated electromagnetic transitions . . .
6. SCATTERING THEORY
6.1 Elementary description of elastic scattering
Scattering by fixed potential. Cross section
Two-body problem. Center-of-mass system
Effect of particle indistinguishability in cross section ....
6.2 Perturbative approach the scattering problem . . . .
Lippmann-Schwinger equation
Born series for scattering amplitude
6.3 Method of partial waves
Expression of elastic scattering in terms of spherical waves .
Inclusion of inelastic scattering
Low-energy & resonance scattering
7. MANY-BODY SYSTEMS
7.1 Formalism of particle creation/annihilation operators
Hilbert space of bosons & fermions
Bosonic & fermionic creation/annihilation operators
Operators in bosonic & fermionic N-particle spaces
Quantization of electromagnetic field
7.2 Many-body techniques
Fermionic mean field & Hartree-Fock method
Bosonic condensates & Hartree-Bose method
Pairing & BCS method
Quantum gases
