In the DSR1 model with subluminal light-speed variation, a boosted box can overtake its own emitted photon above a critical rapidity, leading to tensions in particle counting and motion not resolved by relative locality.
Ackermannet al.(Fermi GBM/LAT), A limit on the variation of the speed of light arising from quantum gravity effects, Nature462, 331 (2009), arXiv:0908.1832 [astro-ph.HE]
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