Specific models of quark–gluon plasma formation

Do gluons saturate when their occupation number is large? Do gluons form a dense system called colour glass condensate? What are the signatures and evidences for the Balitsky–Fadin–Kuraev–Lipatov (BFKL), Balitsky–Kovchegov (BK), Catani–Ciafaloni–Fiorani–Marchesini (CCFM) evolution equations?

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Source: List of unsolved problems in physics (CC BY-SA 4.0)