A+A碰撞真的需要早期热化吗？
Is early thermalization really needed in A+A collisions?
摘要：
在这篇文章中，我们回顾了我们的想法，首次发表于2006年，相应的结果，包括新的，这表明，而假设（部分）热化在相对论性A+A碰撞是真正至关重要的解释软物理观测值，{ \it早期}热化的时间小于1 fm/c的假设是不必要的。后一个结论的原因是，在热物质中的初始横向流动以及它的各向异性，导致横向动量谱的不对称性，可以在预热，无论是部分或经典的场-湍流，阶段，甚至更高的效率比在非常早期的完美流体动力学的情况下。无论压力是否已经建立，这种径向和椭圆流都会发展。其一般原因是系统在横向上的本质有限性。
英文摘要：
In this note we review our ideas, first published in year 2006, and corresponding results, including the new ones, which show that whereas the assumption of (partial) thermalization in relativistic A+A collisions is really crucial to explain soft physics observables, the hypotheses of {\it early} thermalization at times less than 1 fm/c is not necessary. The reason for the later conclusion is that the initial transverse flow in thermal matter as well as its anisotropy, leading to asymmetry of the transverse momentum spectra, could be developed at pre-thermal, either partonic or classical field - Glasma, stage with even more efficiency than in the case of very early perfect hydrodynamics. Such radial and elliptic flows develop no matter whether a pressure already established. The general reason for them is an essential finiteness of the system in transverse direction.
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