2nd Comment on “On the Klein–Gordon oscillator in topologically charged Ellis–Bronnikov type wormhole spacetime”

Attention is drawn to some circumstances that were not quite clearly described in the paper by Soares et al. (Eur Phys J Plus 136:966, 2021) and its previous comment by Amore and Fernandez (Eur Phys J Plus, 2024, this issue), in particular, that the Klein–Gordon field under consideration has a discrete spectrum of positive energy states, hard to be found analytically but approaching the spectrum of a usual quantum oscillator at high levels (n≫1). Corrections to the oscillator spectrum are here calculated in the WKB approximation. © The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024.