Early Time Dynamics in Heavy Ion Collisions from CGC and from AdS-CFT - High Energy Physics - PhenomenologyReport as inadecuate




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Abstract: We review two different theoretical approaches to the strong interactiondynamics at the early times immediately following heavy ion collisions. Oneapproach is based on small-coupling physics of the Color Glass CondensateCGC. The other approach is based on Anti-de Sitter space-Conformal FieldTheory AdS-CFT correspondence and may be applicable to describinglarge-coupling QCD interactions. We point out that in terms of theoreticaltools the two approaches are somewhat similar: in CGC one deals with classicalgluon fields produced in a nuclear shock wave collision, while in AdS-CFT onestudies classical gravity in a gravitational shock wave collision. We stress,however, that the resulting physics is different: the classical gluon fields inCGC lead to a free-streaming medium produced in heavy ion collisions, while theclassical gravity in the 5-dimensional AdS bulk is likely to lead to idealhydrodynamics description of the produced medium. Also, the valence quarks incolliding nuclei in CGC continue along their light cone trajectories after thecollision with very little recoil, while we show that in AdS the collidingnuclei are likely to lose most of their energy in the collision and stop.



Author: Yuri V. Kovchegov

Source: https://arxiv.org/







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