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The mechanism of this long life is unknown.","posed_since":"","precise":"Given a pump of duration $\\sim 1\\,\\mathrm{ps}$ and a metastable state lasting nanoseconds well above $T_c$, identify what stores the nonequilibrium condition (long-lived phonon or orbital populations, structural metastability, or local heating with slow cooling) and predict the lifetime's dependence on fluence and temperature. Answer: a mechanism quantitatively matching measured lifetimes.","problem_ref":null,"references":"","settled_by":"Time-resolved structural and optical measurements tracking the metastable state, with a model reproducing lifetime(fluence, T).","status_note":"","title":"Why the light-induced superconducting-like state lasts 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