Equation of State in the framework of percolation C. Pajares. Univ. Santiago de Compostela In collaboration with J. Dias de Deus, B. Srivastava, A. Hirsch,

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Presentation transcript:

Equation of State in the framework of percolation C. Pajares. Univ. Santiago de Compostela In collaboration with J. Dias de Deus, B. Srivastava, A. Hirsch, R. Sharenberg, I.Bautista Satz FEST, Vienna April 2011

Percolation T. Celik, F. Karsch, H. Satz Phys Lett B (3d percolation)‏ N. Armesto et al PRL (2d per)‏ M. Nardi, H. Satz Phys Lett B H. Satz Nuc Phys A c 1998, Rep Prog Phys Thermal hadronization and Hawking-Unruh radiation in QCD P. Castorina, D. Kharzeev, H. Satz Eur Phys J C D. Kharzeev Eur Phys J A J. Dias de Deus et al Phys LettB P. Castorina, D. Miller, H. Satz arXiv: P. Castorina, R. V. Gavai; H. Satz Eur Phys J C F.Becattini,P.Castorina,A.Milov,H.Satz Eur Phys J C

Color strings are stretched between the projectile and target Strings = Particle sources: particles are created via sea qq production in the field of the string Color strings = Small sources areas in the transverse space filled with color field created by the colliding partons With growing energy and/or atomic number of colliding particles, the number of grows So the elementary color sources start to overlap, forming clusters, very much like disk in the 2-dimensional percolation theory In particular, at a certain critical density, a macroscopic cluster appears, which marks the percolation phase transition

(N. Armesto et al., PRL77 (96); J. Dias de Deus et al., PLB491 (00); M. Nardi and H. Satz (98). How?: Strings fuse forming clusters. At a certain critical density η c (central PbPb at SPS, central AuAu at RHIC, central pp at LHC ) a macroscopic cluster appears which marks the percolation phase transition (second order, non thermal).

Energy-momentum of the cluster is the sum of the energy-momemtum of each string. As the individual color field of the individual string may be oriented in an arbitrary manner respective to one another,

Conclusions Percolation gives a good description of the main observables, including reasonable shear viscosity/entropy density ratio Helmut Satz is in a very good shape as it was (at least)in the last four decades CONGRATULATIONS