Comments on photonic shells

TL;DR

This paper analyzes two types of photonic shells in Minkowski spacetime, comparing their structures and properties to understand their similarities and differences in a detailed theoretical context.

Contribution

It provides a detailed comparison between cylindrical and disk-shaped photonic shells composed of counter-rotating photons in flat spacetime.

Findings

Cylindrical and disk shells exhibit distinct geometric and physical properties.

The comparison clarifies the conditions under which these shells can be considered similar.

Insights into the structure of photon-based shells in flat spacetime are gained.

Abstract

We investigate in detail the special case of an infinitely thin static cylindrical shell composed of counter-rotating photons on circular geodetical paths separating two distinct parts of Minkowski spacetimes--one inside and the other outside the shell--and compare it to a static disk shell formed by null particles counter-rotating on circular geodesics within the shell located between two sections of flat spacetime. One might ask whether the two cases are not, in fact, merely one.