标题： 超越尾流：扩展的夸克-胶子等离子体的非流体动力学响应 显示英文标题

标题： Beyond the wake: non-hydrodynamic response of an expanding Quark-gluon plasma

摘要： 我们研究了响应函数，该函数描述了由初始扰动引起的能量密度演化，针对的是 Bjorken 膨胀的夸克胶子等离子体（QGP）。 我们将求解松弛时间近似下的线性化玻尔兹曼方程得到的结果与粘性流体动力学的结果进行了比较。 虽然在长时间极限下响应变为流体动力学行为，但在中间时间段内，当激发波长大于松弛时间$1/\tau_{R}$的倒数且未完全衰减时，非流体动力学响应变得重要。 因此，对喷射诱导介质激发敏感的可观测量可以用来探索“介观尺度”上 QGP 的性质。 显示英文摘要

摘要： We study the response function which describes the evolution of energy density induced by an initial disturbance for a Bjorken-expanding quark-gluon plasma (QGP). We compare the results from solving linearized Boltzmann equation under the relaxation time approximation with those from viscous hydrodynamics. While in long time limit the response becomes hydrodynamics, the non-hydrodynamic response is important at intermediate times when excitations of wavelength larger than the inverse of the relaxation time $1/\tau_{R}$ are not fully damped. Therefore observables sensitive to the jet-induced medium excitations might be employed to explore the properties of QGP at the "mesoscopic scale".