Long-range effects in asymptotic fields and angular momentum of classical field electrodynamics

TL;DR

This paper investigates the asymptotic behavior of electromagnetic fields in classical electrodynamics, revealing how long-range effects influence conserved quantities like angular momentum and their relation to Coulomb and infrared fields.

Contribution

It demonstrates that conserved Poincare quantities can be expressed via asymptotic fields and identifies the role of long-range variables in angular momentum contributions.

Findings

Conserved quantities are linked to asymptotic electromagnetic fields.

Long-range variables affect angular momentum, blending Coulomb and infrared effects.

Electromagnetic and matter contributions to energy-momentum are separable.

Abstract

Asymptotic properties of classical field electrodynamics are considered. Special attention is paid to the long-range structure of the electromagnetic field. It is shown that conserved Poincare quantities may be expressed in terms of the asymptotic fields. Long-range variables are shown to be responsible for an angular momentum contribution which mixes Coulomb and infrared free field characteristics; otherwise angular momentum and energy-momentum separate into electromagnetic and matter fields contributions.