Comment on Casimir energy for spherical boundaries

TL;DR

This paper defends the stress tensor approach for calculating Casimir energy in spherical boundaries against recent criticisms, reaffirming its validity in theoretical physics.

Contribution

It provides a rebuttal to recent criticisms, clarifying the correctness of stress tensor methods for Casimir energy calculations in spherical geometries.

Findings

Stress tensor treatment remains valid for spherical Casimir energy.

Criticism by Hagen is unfounded and lacks basis.

Reaffirms the theoretical foundation of Casimir energy calculations.

Abstract

It is shown that recent criticism by C. R. Hagen (hep-th/9902057) questioning the validity of stress tensor treatments of the Casimir energy for space divided into two parts by a spherical boundary is without foundation.