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1 Unconventional (?) Expectations for the Large Heavy-Ion Collider Berndt Mueller – Duke University Panel Discussion Quark Matter 2008 Jaipur, India, 2 - 10 February 2008

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2 Two extreme scenarios 1. QGP physics at the LHC will be just like RHIC, only at higher (initial) energy density/temperature and with probes that have a (much) larger kinematic range. 2. QGP physics at the LHC will be quite different from that seen at RHIC, involving an (initially) weakly coupled deconfined phase and an initial state dominated by gluon saturation. The SPS discovered the CQGP; RHIC discovered the BQGP (aka the “perfect liquid”); Will the LHC discover the AQGP ? V. Koch:

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3 Predicting the future is hard… …but we can learn from the past!

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4 A challenge for us all Is QGP physics at RHIC and the SPS the same or different ? Example: 3-particle correlations - is there a Mach cone?

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5 Dynamic range: SPS/RHIC/LHC - (x,t) SPS RHIC LHC (?) HadronsQGP “Hydro works at RHIC, but does not work at the SPS.” - But…

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6 Dynamic range: SPS/RHIC/LHC - (p T ) Statistical hadronization Recombi- nation Jet physics ? ? LHC (?) RHIC SPS How far in p T does the reco domain extend at LHC? Will we see jet-jet recombination? Particle ID up to 30 GeV (?) will be critical to detailed study of hadronization dynamics.

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7 A challenge for theorists What can we learn about the QGP from N = 4 SYM ? What are the limits of a toy model of QCD without an intrinsic scale ? Does the absence of a hadronic phase limit in N = 4 SYM the usefulness of the AdS/CFT duality for HI physics ? Can this limitation be overcome by introducing a confinement scale into the toy model ? Is there an effective AdS/CFT type theory that works both, at low energy and in the domain relevant for hard probes?

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8 Mach cone in QCD vs. N=4 SYM (z - ut) Chesler & Yaffe arXiv:0712.005 0 R.B. Neufeld (preliminary) u = 0.99955 c u = 0.75 c

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9 Virtual Journal on QCD Matter Digest of preprints on hot & dense QCD matter the QGP relat. heavy-ion collisions Targeted at graduate students & junior postdocs Aims to provide a bigger picture, on how individual publications shape the advancement of the field http://qgp.phy.duke.edu/

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Relativistic Heavy Ion Collider and Ultra-Dense Matter.

Relativistic Heavy Ion Collider and Ultra-Dense Matter.

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