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We outline the unique opportunities and challenges in the search for"ultraheavy" dark matter candidates with masses between roughly $10~{\rm TeV}$and the Planck scale $m_{\rm pl} \approx 10^{16}~{\rm TeV}$. This mass rangepresents a wide and relatively unexplored dark matter parameter space, with arich space of possible models and cosmic histories. We emphasize that bothcurrent detectors and new, targeted search techniques, via both direct andindirect detection, are poised to contribute to searches for ultraheavyparticle dark matter in the coming decade. We highlight the need for newdevelopments in this space, including new analyses of current and imminentdirect and indirect experiments targeting ultraheavy dark matter anddevelopment of new, ultra-sensitive detector technologies like next-generationliquid noble detectors, neutrino experiments, and specialized quantum sensingtechniques.

Snowmass2021 Cosmic Frontier White Paper: Ultraheavy particle dark matter