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In this monograph we apply scattering theory methods to calculations in quantum ?eld theory, with a particular focus on properties of the quantum vacuum. These methods will provide e?cient and reliable solutions to a - riety of problems in quantum ?eld theory. Our approach will also elucidate in a concrete context many of the subtleties of quantum ?eld theory, such as divergences, regularization, and renormalization, by connecting them to more familiar results in quantum mechanics. We will use tools of scattering theory to characterize the spectrum of energyeigenstatesinapotentialbackground,...

In this monograph we apply scattering theory methods to calculations in quantum ?eld theory, with a particular focus on properties of the quantum vacuum. These methods will provide e?cient and reliable solutions to a - riety of problems in quantum ?eld theory. Our approach will also elucidate in a concrete context many of the subtleties of quantum ?eld theory, such as divergences, regularization, and renormalization, by connecting them to more familiar results in quantum mechanics. We will use tools of scattering theory to characterize the spectrum of energyeigenstatesinapotentialbackground,...

That the publics of Western democracies are becoming increasingly disenchanted with their political institutions is part of the conventional wisdom in Political Science. This trend is often equated with the expectation that all forms of political attachment and participation show similar patterns of decline. Based on empirical underpinnings derived from a range of original and sophisticated comparative analyses from Europe and beyond, this collection shows that no such universal pattern of decline exists. Nor should it be expected, given the diversity of reasons that citizens have to place or...