4 papers
Infrared Problem in Quantum Electrodynamics
Igor Frolov, Albert Schwarz
It is well known that the inclusive cross section in QED is infrared finite. In the standard diagram techniques this result follows from cancellation of infrared divergences. We co…
Geometric Approach to Quantum Theory. L-functionals
Albert Schwarz
This publication consists of slides from my talk at the Simons Center for Geometry and Physics in 2024. It contains a brief review of the L-functional formalism, along with a discu…
Quantum theory from classical mechanics near equilibrium
Albert Schwarz
We consider classical theories described by Hamiltonians that have a non-degenerate minimum at the point where generalized momenta and generalized coordinates vani…
Adiabatic definitions of scattering matrix and inclusive scattering matrix
Albert Schwarz
The main goal of present paper is to analyze the adiabatic definition of scattering matrix in the formalism of L-functionals. This definition leads to the notion of inclusive scatt…