干涉测量法能探测热化现象吗？
Does interferometry probe thermalization?
摘要：
在二维输运模型下，对超相对论重离子碰撞中的干涉半径进行了系统的研究。我们计算了在不同的克努森数（Knudsen number）值下，系统的横半径R_o和R_s随p_t的变化。它们收敛到流体动力学极限的速度比椭圆流慢得多（3倍）。这解决了HBT中心碰撞的大部分难题：实际Knudsen数的R_o/R_s在1.1-1.2之间，比流体力学计算的1.5更接近实验数据（$\simeq 1$）。R_o和R_s对p_t的依赖性通常被认为反映了集体流，但对热化程度的敏感性也很有限。然后我们研究了非中心碰撞中R_o、R_s和R_{os}的方位角振荡。它们的振幅对努森数的依赖性很小，反映了两核重叠区的偏心率。
英文摘要：
We carry out a systematic study of interferometry radii in ultrarelativistic heavy-ion collisions within a two-dimensional transport model. We compute the transverse radii R_o and R_s as a function of p_t for various values of the Knudsen number, which measures the degree of thermalization in the system. They converge to the hydrodynamical limit much more slowly (by a factor 3) than elliptic flow. This solves most of the HBT puzzle for central collisions: R_o/R_s is in the range 1.1-1.2 for realistic values of the Knudsen number, much closer to experimental data ($\simeq 1$) than the value 1.5 from hydrodynamical calculations. The p_t dependence of R_o and R_s, which is usually said to reflect collective flow, also has a very limited sensitivity to the degree of thermalization. We then study the azimuthal oscillations of R_o, R_s, and R_{os} for non central collisions. Their amplitudes depend little on the Knudsen number, and reflect the eccentricity of the overlap area between the two nuclei.
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