Inclusive Scattering Matrix in Quantum Theory

Explore the concept of inclusive scattering matrix in this 1-hour 8-minute lecture by Albert Schwarz from the University of California at Davis, presented at the Institut des Hautes Etudes Scientifiques (IHES). Delve into the definition of inclusive scattering matrix, which is closely related to inclusive cross-sections and applicable in more general situations than the conventional scattering matrix. Discover how it contains the same information as the conventional matrix when well-defined and learn why it may be the most natural description of scattering in quantum electrodynamics. Examine the general definition of inclusive scattering matrix within the framework of the geometric approach to quantum theory and its expression using generalized Green functions from Keldysh formalism. Gain insights into the formalism of L-functionals and the definition of inclusive scattering matrix in terms of adiabatic S-matrix within this formalism.