A theorist has an idea about the mixing (coupling) of dark matter axions with normal matter through an S/N/S junction. Firstly, the axion is a theorized particle in the WIMPcategory but this expected particle with a mass of 1 μeV is in the WISP (Weakly Interacting Slim Particle) category. The latter is what I have been searching for in a lab experiment—a 53 μeV mass paraphoton—for four years.1 In all these type of experimental searches, these types of putative particles cannot be directly observed but only by their expected effects on normal matter and radiation sectors. So a theorist calculates the magnitude of the mixing parameter (nowadays < 10-8, or much lower) and they run experiments to put an upper limit on it. So if you get a signal—instead of just noise—the signal is from real normal type radiation, thus you have to exclude all possible spurious signals, and usually the detection expected is extremely small so it becomes extremely problematic to definitively say—even if you had an unknown signal—that you have made a detection.