On the effective actions for the spherical charged dust shell in General Relativity

TL;DR

This paper derives effective actions for a spherical charged dust shell in general relativity using a variational principle based on virtual displacements, considering interior and exterior observers and establishing Hamiltonian constraints.

Contribution

It introduces a direct derivation of effective actions for charged dust shells in GR using a relativistic virtual displacement principle, with independent interior and exterior analyses.

Findings

Effective actions describe shell dynamics from interior and exterior perspectives.

Hamiltonian constraints arise from isometry conditions of shell sides.

Special cases like hollow and screening shells are briefly analyzed.

Abstract

A simple and direct, based on the equations of motion, derivation of the variational principle and effective actions for a spherical charged dust shell in general relativity is offered. This principle is based on the relativistic version of the D{\AE}Alembert principle of virtual displacements and leads to the effective actions for the shell, which describe the shell from the point of view of the exterior or interior stationary observers. Herewith, sides of the shell are considered independently, in the coordinates of the interior or exterior region of the shell. Canonical variables for a charged dust shell are built. It is shown that the conditions of isometry of the sides of the shell lead to the Hamiltonian constraint on these interior and exterior dynamical systems. Special cases of the \^ohollow\"o and \^oscreening\"o shells are briefly considered, as well as a family of the concentric charged dust shells.