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It has been shown through the AdS/CFT correspondence that the energy loss ofa fast quark in a strongly coupled ${\cal N}=4$ SUSY Yang--Mills matter in thelarge N limit is given by the classical Lienard formula. I demonstrate thatunder quite natural assumptions about the dynamics of heavy ion collisions thisleads to a universal (i.e. independent of the initial parton energy, butdependent on flavor and centrality) upper bound on the energy of the partonsescaping from the plasma. This bound is a Yang--Mills analog of the Pomeranchukbound in classical electrodynamics, where it is a consequence of radiation in astrong external field acting on a relativistic charge. Since as a result themassive constituent partons are slowed down to a velocity v < c, the angulardistribution of the emitted radiation exhibits a broad "dead cone". If theproperties of conformal and QCD matter at strong coupling are qualitativelysimilar, the existence of this universal upper bound would have dramaticimplications for heavy ion experiments.

Universal upper bound on the energy of a parton escaping from the strongly coupled quark-gluon matter