Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-07-21
Phys.Rev. C70 (2004) 021901
Physics
High Energy Physics
High Energy Physics - Phenomenology
v2 version have one more figure and one more reference, v3 is the same as v2 except a double-page format (the v2 had corrupted
Scientific paper
10.1103/PhysRevC.70.021901
We argue that although at asymptotically high temperatures the QGP in bulk behaves as a gas of weakly interacting quasiparticles (modulo long-range magnetism), at temperatures up to few times the critical temperature $T_c$ it displays different properties. If the running of the QCD coupling constant continues in the Coulomb phase till the screening length scale, it reaches the strong coupling treshold $\alpha_s(m_D)\sim 1$. As a result, the Coulomb phase supports weakly bound Coulombic s-wave $\bar c c$, light quark and even $gg$ states. The existence of shallow bound states dramatically increases the quasiparticle rescattering at low energies, reducing the viscosity and thereby explaining why heavy ion collisions at RHIC exhibit robust collective phenomena. In conformal gauge theories at finite temperature the Coulomb binding persists further in the strong coupling regime, as found for ${\cal N}=4$ SUSY YM in the Maldacena regime.
Shuryak Edward V.
Zahed Ismail
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