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Singular Quadratic Forms in Perturbation Theory (Hardcover, 1999 ed.)
Loot Price: R3,156
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Singular Quadratic Forms in Perturbation Theory (Hardcover, 1999 ed.)
Series: Mathematics and Its Applications, 474
Expected to ship within 10 - 15 working days
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This monograph is devoted to the systematic presentation of the
method of singular quadratic forms in the perturbation theory of
self-adjoint operators. The concept of a singular (nowhere
closable) quadratic form, a key notion of the present volume, is
treated from different points of view such as definition,
properties, relations with regular (closable) quadratic forms,
operator representation, classification in the scale of Hilbert
spaces and especially as an object carrying a singular perturbation
for Hamiltonians. The main idea is to interpret singular quadratic
form in the role of an abstract boundary condition for self-adjoint
extension. Various aspects of the singularity principle are
investigated, such as the construction of singularly perturbed
operators, higher powers of perturbed operators, the transition to
a new orthogonally extended state space, as well as approximation
and regularization. Furthermore, applications dealing with singular
Wick monomials in the Fock space and mathematical scattering theory
are included. Audience: This book will be of interest to students
and researchers whose work involves functional analysis, operator
theory and quantum field theory.
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