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arXiv 0901.4677hep-phnucl-exnucl-th
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相对论扩散与重离子碰撞

Relativistic diffusion and heavy-ion collisions

Rajeev S. Bhalerao, Sourendu Gupta

备注：
8 pages, 5 figures
发表信息：
Phys.Rev.C79:064901,2009
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摘要：

我们研究一阶和二阶理论的相对论扩散耦合到流体力学的近似下，有效的中快度在RHIC和LHC，保守的数密度远小于熵密度。我们确定实验上可访问的感兴趣的数量，并表明，第一和第二阶理论可能会导致这些数量从根本上不同的演变。在一阶理论中，初始状态的记忆几乎被完全洗掉，而在二阶理论中，冻结可能发生在瞬态动力学仍然存在的时候，并且初始状态的记忆仍然存在。我们触及了一些观察结果。在一阶理论中，并且对于当二阶理论模仿一阶时的初始条件，人们可以对扩散常数施加限制。

英文摘要：

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.

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