Translating current ALP photon coupling strength bounds to the Randall-Sundrum model
arXiv:2411.08396 · doi:10.1016/j.dark.2026.102267
Abstract
In this article, we look at the current bounds on the coupling strength of axion-like particles (ALPs) with two photons in the context of the Randall-Sundrum (RS) model. We relate the coupling strength to the compactification radius that governs the size of the extra dimension in the RS warped geometry model and show how the current bounds on the ALP can be used to derive appropriate constraints on the size of the extra fifth dimension in the RS model. We show that the resulting constraints fail to resolve the gauge hierarchy problem for light/ultralight ALPs and require a massive ALP of at least [GeV] to be relevant in the context of the hierarchy problem when the gauge field is in the bulk.
9 pages, 4 figures, updated bibliography; v3 matches version published in Phys. Dark Uni
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