In a recent New Scientist column, physicist Chanda Prescod-Weinstein suggests that dark matter may already have been observed, but the scientific community has not yet settled on what form it takes. The central question, she writes, is whether dark matter should be treated as a particle or as a wave.
That distinction matters because it determines what kind of signal researchers should look for. A particle-like dark matter would produce discrete interactions, while a wave-like dark matter would create interference patterns. Prescod-Weinstein argues that without making this choice, experiments cannot be designed effectively.
The column is a single opinion piece, so there is no contrasting source to compare. It does, however, frame the debate as a practical one for experimentalists, rather than a purely theoretical question.