This book offers a thorough
and self-contained exposition of the mathematics of time-domain boundary
integral equations associated to the wave equation, including applications to
scattering of acoustic and elastic waves. The book offers two different
approaches for the analysis of these integral equations, including a
systematic treatment of their numerical discretization using Galerkin
(Boundary Element) methods in the space variables and Convolution
Quadrature in the time variable. The first approach follows classical work
started in the late eighties, based on Laplace transforms estimates. This
approach has been refined and made more accessible by tailoring the
necessary mathematical tools, avoiding an excess of generality. A second
approach contains a novel point of view that the author and some of his
collaborators have been developing in recent years, using the semigroup
theory of evolution equations to obtain improved results. The extension to
electromagnetic waves is explained in one of the appendices.