Repulsive electromagnetic stresses in the Casimir piston

TL;DR

This paper initially claimed to demonstrate repulsive Casimir forces in a rectangular piston but was withdrawn due to numerical inaccuracies invalidating the main results, though the formulas remain valid.

Contribution

The paper attempted to show the existence of repulsive Casimir forces in a piston configuration, a novel theoretical prediction.

Findings

Main results invalidated by numerical inaccuracies

Formulas provided are still valid

No confirmed evidence of repulsive Casimir forces

Abstract

This manuscript has been withdrawn, since the authors have detected numerical inaccuracies that invalidate their main results concerning the existence of repulsive Casimir forces within a rectangular piston. Formulas presented in the manuscript keep still valid. The authors deeply apologize for this mistake.