Author(s): Caleb Gemmell, Dan Hooper, Seth Koren, and Fabrizio Vassallo 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 $\mathcal{O… [Phys. Rev. Lett. 137, 171802] Published Thu Oct 22, 2026