Comment on "Repulsive Casimir Force in Chiral Metamaterials"

TL;DR

This paper critiques a previous proposal claiming Casimir repulsion using chiral metamaterials, arguing that such a claim conflicts with fundamental physical principles like passivity and causality.

Contribution

It provides a theoretical analysis demonstrating the incompatibility of Casimir repulsion in chiral metamaterials with fundamental physical constraints.

Findings

Casimir repulsion proposal is incompatible with passivity.

Causality constraints prevent Casimir repulsion in these materials.

The analysis challenges previous claims of nanolevitation using chiral metamaterials.

Abstract

It is shown that the proposal of Ref. [1] of Casimir repulsion and nanolevitation based on chiral metamaterials is incompatible with the passivity and causality of the materials.