Comment on "Limit on the Electron Electric Dipole Moment in Gadolinium-Iron Garnet" [arXiv:physics/0509106]

TL;DR

This comment critiques a proposed method for detecting the electron EDM in GdIG, questioning the interpretation of sample polarization and emphasizing a Lorentz covariant interaction explanation.

Contribution

It challenges the original interpretation of polarization in GdIG as evidence of electron EDM detection, proposing an alternative Lorentz covariant interaction explanation.

Findings

Questions the collinearity assumption of electron EDM and magnetic moment.

Suggests polarization can be explained by Lorentz covariant interactions.

Critiques the validity of the proposed detection method.

Abstract

In the paper being commented on it is proposed a new method for the detection of the electron EDM using the solid GdIG. There, it is argued that a sample electric polarization appears when the sample is magnetized; the common belief is that the electron EDM must be collinear with its magnetic moment. All this is objected and it is suggested that the polarization of the sample can be explained by the direct, Lorentz covariant, interaction between B^{a} and an EDM d^{a}.