Scattering theory is the study of an interacting system on a scale of time and/or distance which is large compared to the scale of the interaction itself. As such, it is the most effective means, sometimes the only means, to study microscopic nature. To understand the importance of scattering theory, consider the variety of ways in which it arises. First, there are various phenomena in nature (like the blue of the sky) which are the result of scattering. In order to understand the phenomenon (and to identify it as the result of scattering) one must understand the underlying dynamics and its scattering theory. Second, one often wants to use the scattering of waves or particles whose dynamics on knows to determine the structure and position of small or inaccessible objects. For example, in x-ray crystallography (which led to the discovery of DNA), tomography, and the detection of underwater objects by sonar, the underlying dynamics is well understood. What one would like to construct are correspondences that link, via the dynamics, the position, shape, and internal structure of the object to the scattering data. Ideally, the correspondence should be an explicit formula which allows one to reconstruct, at least approximately, the object from the scattering data. The main test of any proposed particle dynamics is whether one can construct for the dynamics a scattering theory that predicts the observed experimental data. Scattering theory was not always so central the physics. Even thought the Coulomb cross section could have been computed by Newton, had he bothered to ask the right question, its calculation is generally attributed to Rutherford more than two hundred years later. Of course, Rutherford's calculation was in connection with the first experiment in nuclear physics.
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auxiliary space method
MATERIAL PREPRINTED FROM VOLUME IV
List of Symbols
absolutely continuous absolutely continuous spectrum analytic asymptotic completeness boundary conditions bounded operator classical cluster Comm commutes compact support converges Cook's method coordinates Corollary define dense set differential equation discussed eigenfunction eigenfunction expansions eigenvalues energy equivalent estimate Example exist fact field theory finite fixed follows formula Fourier transform function Hamiltonian Hilbert space Hilbert-Schmidt holds hypotheses implies interacting invariance kernel Klein-Gordon equation Lax-Phillips Lemma Let H linear Lippmann-Schwinger equation Math measure Moreover norm notes to Section obeys orthogonal particles perturbation physical Plancherel theorem potentials Problem proof of Theorem properties prove quantum field quantum field theory Ran Q result s-lim S-matrix satisfies scattering operator scattering theory Schrodinger operators self-adjoint operator smooth solution spectral spin subspace Suppose Theorem XI Theorem XI.82 tion trace class two-body uniformly unitary vector wave equation wave operators zero