Functional Integral Method in Quantum Theory of Composite Particles and Quasiparticles
Nguyen Van Hieu
Abstract
In this series of lectures we present the universal method based on the use of the functional integrals to derive the bound state equations for different two-body systems in elementary particle physics as well as in condensed matter theory: the relativistic Nambu-Jona-Lasinio equation and the relativistic Bethe-Salpeter equation in elementary particle physics, the Bethe-Salpeter equation for the bipolaritons. The bound state equation for the three-body systems is also established.
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