论文标题
Quark-Gluon等离子体和等离子体不稳定性的探针
Probes of the quark-gluon plasma and plasma instabilities
论文作者
论文摘要
重型离子碰撞中的穿透探针，例如喷气机和光子，对产生的夸克 - 胶原等离子体的传输系数（例如剪切和散装粘度）敏感。量化这种敏感性需要详细了解非平衡等离子体中的光子发射和喷气 - 中等相互作用。到目前为止，在评估硬探针与等离子体的相互作用速度时，血浆不稳定性阻碍了血浆不稳定性，并导致虚假分歧。在本文中，我们表明，考虑到不稳定等离子体的时间演变可以治愈这些分歧。我们计算出具有小初始动量各向异性的设置中Gluon两点相关器的时间演变，并表明Gluon占用密度在早期时呈指数增长。基于此计算，我们主张了减去不稳定性杆的现象学处方。最后，我们表明，在阿贝尔病例中，不稳定性领域不会影响中等诱导的光子发射到我们的近似阶。
Penetrating probes in heavy-ion collisions, like jets and photons, are sensitive to the transport coefficients of the produced quark-gluon plasma, such as shear and bulk viscosity. Quantifying this sensitivity requires a detailed understanding of photon emission and jet-medium interaction in a non-equilibrium plasma. Up to now, such an understanding has been hindered by plasma instabilities which arise out of equilibrium and lead to spurious divergences when evaluating the rate of interaction of hard probes with the plasma. In this paper, we show that taking into account the time evolution of an unstable plasma cures these divergences. We calculate the time evolution of gluon two-point correlators in a setup with small initial momentum anisotropy and show that the gluon occupation density grows exponentially at early times. Based on this calculation, we argue for a phenomenological prescription where instability poles are subtracted. Finally, we show that in the Abelian case instability fields do not affect medium-induced photon emission to our order of approximation.
