Production of light pseudoscalars in external electromagnetic fields by the Schwinger mechanism
J. A. Grifols, Eduard Masso, Subhendra Mohanty

TL;DR
This paper extends the Schwinger mechanism to compute the probability of pseudoscalar particle production in strong electromagnetic fields, correcting previous estimates for axion emission.
Contribution
It generalizes the Schwinger mechanism for pseudoscalar production and revises earlier axion emission estimates.
Findings
Derived new probability formulas for pseudoscalar production
Corrected previous axion emission estimates
Enhanced understanding of particle production in electromagnetic fields
Abstract
We generalize the Schwinger mechanism and calculate the probability of the decay of intense electromagnetic fields to pseudoscalar particles. We also point out that our estimate for axion emission in a previous paper was incorrect.
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