Novel Mechanisms for repulsive Casimir forces

TL;DR

This paper introduces two innovative models demonstrating repulsive Casimir forces between positive perturbations, expanding understanding beyond traditional 1D massless theories and highlighting the roles of nonlocal dielectric responses and mode interference.

Contribution

The paper presents two new models for repulsive Casimir interactions that incorporate nonlocal dielectric effects and mode interference, surpassing previous theoretical limitations.

Findings

Repulsive Casimir forces can be achieved with nonlocal dielectric responses.

Interference between modes can produce repulsive interactions.

Such models are impossible in 1D massless theories due to existing no-go results.

Abstract

We present two novel models for repulsive Casimir interaction between positive perturbations. One example relies on non locality of the dielectric response and one relies on interference between (attractive) modes. Such examples are impossible to achieve in 1d massless theories, as they are prohibited by a generalization of the result of Lambrecht, Jaekel and Reynaud [Phys.Lett. A 225 (1997)] to non local dielectrics and to negative perturbations