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Whether this active glass follows the same physics as an ordinary glass with an effective temperature, or a different one, is not known.","posed_since":"","precise":"For dense active Brownian or active Ornstein-Uhlenbeck particles with active force $f_0$ and persistence time $\\tau_p$, determine the dynamical arrest line $\\phi_g(f_0, \\tau_p)$ and whether fragility, dynamic heterogeneity ($\\chi_4$) and the relaxation spectrum map onto those of the passive glass at an effective temperature, given reports that $\\tau_{\\alpha}$ depends non-monotonically on $\\tau_p$ at fixed effective temperature. An answer is the arrest diagram with a quantitative test of the effective-temperature mapping and a theory that predicts where it fails.","problem_ref":null,"references":"","settled_by":"Simulations over several decades of $\\tau_{\\alpha}$ and $\\tau_{p}$, compared with an active mode-coupling or other theory, and with measurements on dense active colloids or cell monolayers.","status_note":"Reviewed in 2019 (Janssen, Active glasses, J. Phys.: Condens. Matter, https://doi.org/10.1088/1361-648X/ab3e90); no consensus theory as of 2026.","title":"How self-propulsion changes the glass transition of dense active 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