Towards Infrared Finite S-matrix in Quantum Field Theory

Towards Infrared Finite S-matrix in Quantum Field Theory
Author :
Publisher : Springer Nature
Total Pages : 134
Release :
ISBN-10 : 9789811630453
ISBN-13 : 9811630453
Rating : 4/5 (53 Downloads)

Book Synopsis Towards Infrared Finite S-matrix in Quantum Field Theory by : Hayato Hirai

Download or read book Towards Infrared Finite S-matrix in Quantum Field Theory written by Hayato Hirai and published by Springer Nature. This book was released on 2021-07-17 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the better understanding of infrared structures of particle scattering processes in quantum electrodynamics (QED) in four-dimensional spacetime. An S-matrix is the fundamental quantity in scattering theory. However, if a theory involves massless particles, such as QED and gravity, the conventional S-matrix has not been well defined due to the infrared divergence, and infrared dynamics thus needs to be understood in-depth to figure out the S-matrix. The book begins with introducing fundamental nature of the charge conservation law associated with asymptotic symmetry, and explaining its relations to soft theorems and memory effect. Subsequently it looks into an appropriate asymptotic state of the S-matrix without infrared divergences. The Faddeev-Kulish dressed state is known as a candidate of such a state, and its gauge invariant condition and its relation to the asymptotic symmetry are discussed. It offers an important building blocks for constructing the S-matrix without infrared divergences.


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