Hilbert Space Methods in Quantum Mechanics: 1st Edition (Hardback) book cover

Hilbert Space Methods in Quantum Mechanics

1st Edition

By Werner O. Amrein

EPFL Press

350 pages

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Hardback: 9781420066814
pub: 2009-07-06
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Linear operators in Hilbert spaces play a fundamental role in the formulation of quantum theory. With complete proofs and numerous exercises, this book offers a self-contained presentation of the most important tools and methods from Hilbert space theory, with a particular focus on the spectral theory of self-adjoint operators. It also goes further by describing several applications in quantum mechanics, including the analysis of Schrödinger operators and quantum scattering theory. In addition, the book discusses Mourre’s conjugate operator method and its consequences for scattering theory. Based on a one-year course for advanced undergraduates, this text provides a fundamental treatment of the basic ideas of applied Hilbert space theory.

Table of Contents


Hilbert Spaces

Definition and elementary properties

Vector-valued functions

Subsets and dual of a Hilbert space

Measures, integrals and L p spaces


Linear Operators

The algebra B(H)

Projections and isometries

Compact operators

Unbounded operators

Multiplication operators

Resolvent and spectrum of an operator

Perturbations of self-adjoint operators



Symmetric Operators and their Extensions

The method of the Cayley transform

Differential operators with constant coefficients

Schr¨odinger operators



Spectral Theory of Self-Adjoint Operators

Stieltjes measures

Spectral measures

Spectral parts of a self-adjoint operator

The spectral theoremThe resolvent near the spectrum

Appendix: Proof of the Spectral Theorem


Evolution Groups and Scattering Theory

Evolution groups

Characterisation of the scattering states

Asymptotic conditionWave operators

Simple scattering systemsScattering operator

Scattering operator and S-matrix

Scattering cross sections

Bounds on scattering cross sections

Coulomb scattering


The Conjugate OperatorMethod

A simple example

The method of differential inequalities

The Mourre inequality

Application to Schr¨odinger operators

Relatively smooth operators

Higher order resolvent estimates

Some commutators

Appendix: Interpolation of operators


Further Topics in Scattering Theory

Asymptotic completeness

Flux and scattering into cones

Time-independent scattering theory

The scattering matrix

Time delay




Notation Index

Subject Index

Subject Categories

BISAC Subject Codes/Headings:
SCIENCE / Physics
SCIENCE / Quantum Theory