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Axion-like particle oscillations
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String theory compactifications may generate many light axion-like particles (ALPs) with weak couplings to electromagnetism. In general, a large number of ALPs may exist, with a linear combination having a potentially observable coupling to electromagnetism. The basis in which only one ALP couples to electromagnetism is in general misaligned with the mass basis. This leads to mixing between the `electromagnetic' ALP and a number of `hidden' ALPs that do not interact directly with the photon. The process is analagous to neutrino oscillations. I will discuss the phenomenological consequences of this mixing for astrophysical ALP signals, in particular showing that it may significantly reduce the predicted signal in experiments such as the CERN Axion Solar Telescope.
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Darkly Charged ALPs
Darkly charged ALPs (DALPs) forbid all d=5 ALP-SM operators and admit only two leading d=6 operators (Higgs portal and hypercharge portal), with distinct collider, cooling, and dark-matter phenomenology.
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