Casimir energy in a spherical surface within surface impedance approach: the Drude model

TL;DR

This paper calculates the Casimir energy for a spherical surface using surface impedance with the Drude model, exploring how material properties influence force sign and generalizing previous results.

Contribution

It introduces a generalized approach to Casimir energy calculation for spherical surfaces with Drude model impedance, analyzing force modulation possibilities.

Findings

Casimir energy depends on material properties modeled by Drude.

Sign of Casimir force can be tuned from repulsive to attractive.

The approach extends previous models to more realistic material descriptions.

Abstract

The Casimir Energy of a spherical surface characterized by its surface impedance is calculated. The material properties of the boundary are described by means of the Drude model, so that a generalization of previous results is obtained. The limits of the proposed approach are analyzed and a solution is suggested. The possibility of modulating the sign of the Casimir force from positive (repulsion) to negative (attraction) is studied.