Relativistic Electron-Photon Interactions in the Atomic Field

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It is intended to undertake several related investigations into processes of high energy atomicphysics, including their extension toward lower energies. This involves studying the interactionsof photons and electrons with correlated atomic structures, including circumstances in whichthere are several interacting continuum particles in the final state. These studies can yieldunderstanding of the role of relativistic, retardation and higher multipole effects in regimeswhere they become comparable to or dominate the many electron correlation effects, and it canlead to an identification of the nature of the correlation effects which persist at high energies.Specific studies include: examining high energy behaviors of atomic processes, the extent towhich these behaviors follow from the singularities of photon and electron interactions, and theextent to which they depend on correlations; understanding other global features of processes,such as analyticity, also the trajectories of zeroes which serve as a surrogate for structuralinformation; clarifying the relations and transitions between classical and quantum behavior; andstudying the relationships among observables, partitioning, and entanglement. Other projectsinclude considerations of deficiencies in the description of basic processes, such as Delbruckscattering and bremsstrahlung, and characterization of atomic processes (such asphotoionization, Rayleigh and Compton scattering and bremsstrahlung) and the independentatomic information they contain.