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In perovskites they stay hot much longer at high light intensity, and why is debated.","posed_since":"","precise":"At excitation densities above about $10^{18}\\,\\mathrm{cm}^{-3}$, hot-carrier cooling in MAPbI3 and $\\mathrm{CsPbBr_3}$ slows from about 0.3 ps to tens or hundreds of ps. Separate the contributions of the hot-phonon bottleneck (slow decay of longitudinal-optical phonons), Auger reheating, and large-polaron screening, and determine whether any slowdown persists below $10^{17}\\,\\mathrm{cm}^{-3}$, the density under sunlight. An answer is quantified cooling-time contributions versus density and temperature.","problem_ref":"5ee2e10d27d8219cd612b8ced707c297bf67d5a12bf4fa61580742646a4a2542","references":"","settled_by":"Density-resolved two-dimensional or transient spectroscopy with direct phonon-population probes, reproduced by a coupled carrier-phonon kinetic model.","status_note":"The hot-phonon bottleneck at high density is widely accepted; the low-density polaron-screening claim remains contested.","title":"Mechanism of slow hot-carrier cooling in lead-halide 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