Comment on "Nontrivial Quantum Geometry and the Strength of Electron-Phonon Coupling", arXiv:2305.02340, J. Yu, C. J. Ciccarino, R. Bianco, I. Errea, P. Narang, B. A. Bernevig
arXiv:2306.02375
Abstract
The titular manuscript invites a description of the background of research on MgB,whose unique electron-phonon coupling strength and record superconducting T for such a material at ambient pressure was demonstrated by the combined efforts of several groups two decades ago in terms of conventional but highly developed Migdal-Eliashberg theory. This Comment provides some of the basic features of the theoretical understanding of MgB and draws contrasts with the model of Yu {\it et al.}
5 pages of text and references