Rice University uses levitated magnet to detect ultraheavy dark matter

Rice University physicists have unveiled a new experimental approach to detect ultraheavy dark‑matter particles, extending the search for some of the most massive candidates of the invisible substance believed to bind galaxies. The effort, led by associate professor of physics and astronomy Christopher Tunnell, employs a magnetically levitated particle—a microscopic floating magnet—that functions as an ultra‑sensitive detector capable of sensing the minute impulse that would be imparted by an ultraheavy dark‑matter particle traversing the apparatus.

The levitated magnet is suspended in a vacuum chamber and monitored for tiny displacements that would indicate a collision with a passing particle of extreme mass. By measuring such displacements with high precision, the system aims to identify interactions that conventional detectors, optimized for lighter dark‑matter candidates, might miss. The experiment broadens the mass range under investigation and, if successful, could provide the first direct evidence of ultraheavy dark matter, informing theoretical models and guiding future searches.