Collision

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QGP:
T > T_c ≈ 155 MeV deconfined quark-gluon matter

Perfect fluid:
η/s ≈ 1/4π (KSS bound) — most perfect fluid known

Jet quenching:
Hard partons lose energy traversing dense QGP via gluon bremsstrahlung (dE/dx ~ αs²T²L)