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arXiv 1307.7611hep-phnucl-th
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重离子碰撞流体动力学描述中初始涨落的表征

Characterization of initial fluctuations for the hydrodynamical description of heavy ion collisions

Stefan Floerchinger, Urs Achim Wiedemann

摘要:

逐事件波动的初始条件的流体动力学描述的重离子碰撞的特点。我们提出了一个贝塞尔-傅立叶分解的方位角,在横向平面的半径和快度。这允许在所有流体动力学领域的波动,包括能量密度,压力,流体速度,剪切应力和体积粘性压力的完整表征。它的优点是波动可以相对于它们的波长进行排序,并且它们可以在流体动力学形式体系内逐模式传播。然后,事件集合可以根据函数概率分布来表征。对于Monte Carlo Glauber模型的事件系综,我们提供的证据表明,后者接近高斯形式,从而允许一个特别简单的事件分布的表征。

英文摘要:

Event-by-event fluctuations in the initial conditions for a hydrodynamical description of heavy-ion collisions are characterized. We propose a Bessel-Fourier decomposition with respect to the azimuthal angle, the radius in the transverse plane and rapidity. This allows for a complete characterization of fluctuations in all hydrodynamical fields including energy density, pressure, fluid velocity, shear stress and bulk viscous pressure. It has the advantage that fluctuations can be ordered with respect to their wave length and that they can be propagated mode-by-mode within the hydrodynamical formalism. Event ensembles can then be characterized in terms of a functional probability distribution. For the event ensemble of a Monte Carlo Glauber model, we provide evidence that the latter is close to Gaussian form, thus allowing for a particularly simple characterization of the event distribution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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