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Whether this effect is large enough to matter is disputed.","posed_since":"","precise":"Inversion-breaking lattice fluctuations in MAPbI3 could produce a dynamic Rashba splitting that offsets the band extrema in momentum and lowers the bimolecular radiative coefficient $B$ (measured of order $1e-10\\,\\mathrm{cm}^3/\\mathrm{s}$). Determine the size of the room-temperature splitting (static or dynamic, in meV) and its effect on $B$, with photon recycling separated out. An answer is the splitting value and the fractional change of $B$.","problem_ref":null,"references":"","settled_by":"Spin- and momentum-resolved photoemission or circularly polarized spectroscopy at room temperature combined with molecular-dynamics band-structure calculations.","status_note":"","title":"Does dynamic Rashba splitting slow radiative recombination in 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