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We use AdS/CFT correspondence to study two-particle correlations in heavy ioncollisions at strong coupling. Modeling the colliding heavy ions by shock waveson the gravity side, we observe that at early times after the collision thereare long-range rapidity correlations present in the two-point functions for theglueball and the energy-momentum tensor operators. We estimate rapiditycorrelations at later times by assuming that the evolution of the system isgoverned by ideal Bjorken hydrodynamics, and find that glueball correlations inthis state are suppressed at large rapidity intervals, suggesting thatlate-time medium dynamics can not "wash out" the long-range rapiditycorrelations that were formed at early times. These results may provide aninsight on the nature of the "ridge" correlations observed in heavy ioncollision experiments at RHIC and LHC, and in proton-proton collisions at LHC.

Long-Range Rapidity Correlations in Heavy Ion Collisions at Strong Coupling from AdS/CFT