That weird anti-helium they found on the Space Station? It might actually be coming from dark matter hitting something in the shadows.
arXiv · March 16, 2026 · 2603.12314
Why it matters
A detector in space has spotted several anti-helium-3 nuclei, which are incredibly difficult to produce through known natural processes. This new model suggests that dark matter doesn't just turn into energy, but into specific heavy particles that act as 'factories' for antimatter, explaining the mystery signals better than any previous theory.
From the abstract
Antideuterons and antihelium nuclei in the cosmic-ray spectrum have long been considered a smoking gun signature of dark matter annihilation, making the tentative observation of several such events by AMS highly intriguing. Conventional dark matter models, however, can produce only up to O(1) antideuteron events at AMS and are not capable of generating observable fluxes of antihelium. In this letter, we propose a class of models in which dark matter annihilates into particles carrying baryon and