Comment on "Spontaneous baryosynthesis with large initial phase"

TL;DR

This paper critiques a recent study on spontaneous baryogenesis, highlighting a significant technical flaw in their derivation when moving beyond the small-angle approximation.

Contribution

It identifies a critical shortcoming in the recent work's derivation, emphasizing the importance of correct treatment without the small-angle approximation.

Findings

Highlights a serious technical shortcoming in the recent derivation.

Underscores the need for careful analysis beyond the small-angle approximation.

Calls for revisiting previous results with proper methods.

Abstract

Recently arXiv:2512.11011 set out to improve on previous work from 1994 by Dolgov and Freese, who used a small-angle approximation to derive the yield of spontaneous baryogenesis from a rolling phase, a pseudo-Nambu-Goldstone boson coupled to the baryon current. The goal of the recent paper was to investigate what happens when the small-angle approximation is not imposed. I point out a serious technical shortcoming in their derivation.