强耦合下早期光子与磁场的流动和偏振
Flows and polarization of early photons with magnetic field at strong coupling
摘要：
最近RHIC和LHC对重离子碰撞中硬光子发射率的实验结果表明，由椭圆流v_2参数化的光子发射率具有很大的方位不对称性。最近的一个建议，早期的磁场产生的两个重离子碰撞可能是负责这种大的方位角不对称的光子发射率的启发，我们计算的方位角依赖强耦合有限温度等离子体与磁场的规范/重力对应的框架。我们还提出并计算了一个新的观察，“在/出平面偏振不对称性”，构造从光子发射率的偏振依赖性。我们观察到，无论是方位角和偏振不对称的光子发射的强烈影响的三角形异常（手征异常）的低频制度低于1 GeV。
英文摘要：
Recent experimental results from RHIC and LHC on hard photon emission rates in heavy-ion collisions indicate a large azimuthal asymmetry of photon emission rate parameterized by the elliptic flow v_2. Motivated by a recent proposal that the early magnetic field created by two colliding heavy-ions may be responsible for this large azimuthal asymmetry of photon emission rate, we compute the azimuthal dependence of the photon emission rate from a strongly coupled finite temperature plasma with magnetic field in the framework of gauge/gravity correspondence. We also propose and compute a new observable, "in/out-plane polarization asymmetry", constructed from the polarization dependence of the photon emission rates. We observe that both the azimuthal and polarization asymmetry of photon emissions are strongly affected by the triangle anomaly (chiral anomaly) for low frequency regime below 1 GeV.
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