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Detecting or excluding this needs massive superpositions or very quiet detectors.","posed_since":"","precise":"In the Diosi-Penrose model a superposition decays at rate $\\Gamma = E_G / \\hbar$, with $E_G$ the gravitational self-energy of the difference of the two mass distributions, regularized by a length $R_0$. X-ray bounds give $R_0 > 4.9 \\times 10^{-8}\\,\\mathrm{cm}$ (XENONnT, 90 percent C.L.) for the Markovian version. Determine whether a superposition experiment, or a non-radiating dissipative version of the model, can reach the regime where $\\Gamma$ exceeds all environmental decoherence for allowed $R_0$, and measure or exclude it.","problem_ref":"df7213aca5e52e3c25bed6c5b7d08c1b39eb9bde80fede6f3d6c9bb867744afc","references":"","settled_by":"Observation or exclusion of excess decoherence at rate $E_{G} / \\hbar$ in a massive superposition where environmental rates are below it.","status_note":"Underground X-ray searches (Donadi et al., Nature Physics 2021; XENONnT, Phys. Rev. Lett. 136, 120201, 2026) excluded the Markovian model with $R_0$ below about $5 \\times 10^{-8}\\,\\mathrm{cm}$, about fivefold beyond the previous Majorana Demonstrator bound; larger $R_0$ and dissipative versions are untested.","title":"Test of gravity-related collapse in the Diosi-Penrose 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