1. Understanding the quark-gluon-plasma using AdS/CFT
Amos Yarom, Munich
together with: S. Gubser and S. Pufu
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2. The quark gluon plasma at RHICV S C H Y O N D

3. Friction coefficient for QCD plasma
t p = - p + F
0.3 fm/c <  < 8 fm/c

4. Friction coefficient in N=4 SYM
(Gubser 2006, Holzhey, Karch, Kovtun, Kozcaz, Yaffe, 2006) z0 z
AdS/CFT
J. Maldacena

5. Friction coefficient in N=4 SYM
(Gubser 2006, Holzhey, Karch, Kovtun, Kozcaz, Yaffe, 2006) F
AdS/CFT
J. Maldacena z0 z
F= (  1/2 T2 / 2m) p
b = 0.5 fm/c
c = 1.2 fm/c
0.3 fm/c <  < 8 fm/c

6. Energy loss Sound modes? Diffusion? Radiation? AdS/CFT z0 z
AdS/CFT
J. Maldacena
Sound modes?
Diffusion?
Radiation? z0 z

7. Energy loss z0 z
AdS5
CFT
G
<Tij>
Dh = J

8. Energy density for v=3/4
Over energy
Under energy

9. Energy density for v=3/4

11. v=0.75
v=0.58
v=0.25

12. Summary
N=4 SYM plasma exhibits a Mach cone and hydrodynamic behavior at large distances (2 fm).
At short distances N=4 SYM plasma shows transient behavior at velocities of 5/13<v2<5/8. This suggests a different physical model at short distances.

13. Jet quenching parameter