In this chiral U(1)_{B-L} axion model, demanding high axion quality forces a minimal axion-electron coupling that can exceed standard KSVZ-model predictions.
Global vs local cosmic strings from pseudo-anomalous U(1)
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abstract
We study the structure of cosmic strings produced at the breaking of an anomalous U(1) gauge symmetry present in many superstring compactification models. We show that their coupling with the axion necessary in order to cancel the anomalies does not prevent them from being local, even though their energy per unit length is found to diverge logarithmically. We discuss the formation of such strings and the phenomenological constraints that apply to their parameters.
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A quality-coupling relation in chiral $U(1)_{B-L}$ axion model
In this chiral U(1)_{B-L} axion model, demanding high axion quality forces a minimal axion-electron coupling that can exceed standard KSVZ-model predictions.