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The Pece Quinn Scale and the Axion
The axion is a spinoff, a spandrel, from an attempt to solve what is called the strong CP problem. The way it is produced in the early universe is completely different from the way wimps are produced. We haven't found it yet, but we also haven't ruled out as much of the viable parameter space. Some models that are proposed imply that essentially we will never directly detect the dark matter.