Comment on "Origin of cosmic magnetic fields"
Ruth Durrer, Giovanni Marozzi, Massimiliano Rinaldi

TL;DR
This paper critiques a previous work on cosmic magnetic fields, claiming its main result is unphysical and questioning the validity of its conclusions.
Contribution
It provides a critical analysis of Campanelli's claims about the origin of cosmic magnetic fields, highlighting potential issues in the original argument.
Findings
Identifies unphysical assumptions in Campanelli's work
Challenges the validity of the proposed mechanisms for cosmic magnetic field origin
Suggests the need for revised models or approaches
Abstract
We argue that the result presented in "Origin of cosmic magnetic fields" by L. Campanelli [arXiv:1304.6534] is unphysical.
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