In a Randall-Sundrum warped extra dimension, the gauge-symmetry-protected axion can form low-tension cosmic strings at junctions of bubbles in a first-order phase transition, unlike earlier string axion models with Planck-scale strings.
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Axion strings from string axions
In a Randall-Sundrum warped extra dimension, the gauge-symmetry-protected axion can form low-tension cosmic strings at junctions of bubbles in a first-order phase transition, unlike earlier string axion models with Planck-scale strings.