Comment on 'Attempts to test an alternative electrodynamic theory of superconductors by low-temperature scanning tunneling and atomic force microscopy'

TL;DR

This paper critiques Hirsch's alternative electrodynamics theory of superconductors, arguing it is mathematically flawed and gauge non-invariant, thus questioning the validity of experiments designed to test it.

Contribution

It provides a critical analysis showing the theoretical and conceptual flaws in Hirsch's proposed electrodynamics of superconductivity.

Findings

Hirsch's theory lacks mathematical rigour

The theory is gauge non-invariant

Experimental tests based on the theory are inconclusive

Abstract

It is argued that alternative electrodynamics of superconductivity proposed by Hirsch lacks mathematical rigour and it is conceptually flawed. Gauge non-invariance of the theory makes justification of the experiment reported in [arXiv:1607.05060] to test its prediction doubtful. It seems even with improved techniques the outcome would remain inconclusive.