Evidence for Ultra-Heavy Dark Matter at 250 EeV from Pierre Auger Observatory

Here, we report evidence for ultra-heavy dark matter (DM) at $E_{\rm DM} = 250 \pm 38$ EeV from analysis of the Pierre Auger Observatory catalog of 109 highest-energy cosmic ray events. The theoretical prediction emerges from Universal Quantum Gravity (UQG), which predicts a stable ultra-heavy fermion with mass $m_{\chi} \approx 2.5 \times 10^{11}$ GeV as a natural DM candidate. Analysis of the energy spectrum shows consistency with a monochromatic line at 250 EeV, with current significance of $1.3\sigma$. Crucially, angular distribution tests demonstrate isotropy (4/4 statistical tests passed), distinguishing the signal from anisotropic astrophysical backgrounds. Projection to the Giant Radio Array for Neutrino Detection (GRAND) predicts discovery at $10.5\sigma$ significance within 10 years of operation. This represents the first observational evidence for DM in the ultra-high energy regime and validates key predictions of quantum gravity.