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A Non-Inflationary Axion and ALP Misalignment Mechanism (2507.00785v1)
Published 1 Jul 2025 in hep-ph, astro-ph.CO, gr-qc, and hep-th
Abstract: Based on considerations of quantum gravity, global symmetries which lead to axions as pseudo Nambu-Goldstone bosons after low scale symmetry breaking cannot be exact at the Planck scale. Here, we show that Planck-suppressed terms which yield this symmetry breaking may provide a non-inflationary misalignment mechanism which can generate coherent oscillations of the axion and axion-like particle (ALP) fields at low temperatures.
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