Comment on "Black holes constrain varying constants"

TL;DR

The paper critiques a recent claim that black hole entropy considerations impose constraints on the variation of fundamental constants, arguing that such theoretical approaches lack model-independent validity.

Contribution

It challenges the idea that black hole entropy arguments can definitively constrain variations in fundamental constants, emphasizing the limitations of purely theoretical considerations.

Findings

Black hole entropy arguments may not provide model-independent constraints.

Theoretical considerations alone are insufficient to limit fundamental constant variations.

The interpretation of varying constants requires careful analysis beyond black hole thermodynamics.

Abstract

A recent paper [DDL] claims that the increase of the proton electric charge e leads to a (forbidden) decrease of black hole entropy, therefore, possible evidence for variation of $\alpha=e^2/\hbar c$ [alpha] must be interpreted as a decrease of the speed of light. We argue that purely theoretical consideration of black holes possibly cannot give any model-independent limitations on variation of fundamental constants.