Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-01-29
Phys.Rev.C79:064901,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 5 figures
Scientific paper
10.1103/PhysRevC.79.064901
We study first and second order theories of relativistic diffusion coupled to hydrodynamics under the approximation, valid at mid-rapidity in the RHIC and LHC, that conserved number densities are much smaller than the entropy density. We identify experimentally accessible quantities of interest, and show that the first and second order theories may lead to radically different evolutions of these quantities. In the first order theory the memory of the initial state is almost completely washed out, whereas in the second order theory it is possible that freezeout occurs at a time when transient dynamics is still on, and the memory of the initial state remains. There are observational consequences which we touch upon. In the first order theory, and for initial conditions when the second order theory mimics the first order, one may be able to put a bound on the diffusion constant.
Bhalerao Rajeev S.
Gupta Sourendu
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