Dynamic Time Scales in Colored Glass Nuclear Matter

Abstract

In Ultra high energy collisions, the concept of a glass law is invoked in the framework of 'low tension' QCD strings. It is shown that the excitation of QCD strings at low energy has a negative temperature and at high energy has a positive temperature always higher than the Hagedorn temperature, T_H. Very high energy strings T->T_H + 0+ move very slowly as a viscous melted glass with very high viscosity. However, in a very short collision time, it is difficult to transfer the initial collision kinetic energy into the internal energy of a few strings. The low energy strings at high T>>T_H have a low viscosity giving rise to an almost perfect fluid. The role of strings in a nucleus is closely analogous to the role of polymer chains in some viscous glass beads.

Based on the talk presented (By Vivek Parihar) at the 44th International School of Subnuclear Physics ISSP-2006, Erice, Italy. Interpretation of an ideal fluid in high energy collisions is discussed. To be published in the Proc. Of ISSP, World Scientific