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arXiv 1602.06176nucl-th
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RHIC和LHC的磁场诱导压缩效应

Magnetic field-induced squeezing effect at RHIC and at the LHC

Long-gang Pang, Gergely Endrődi, Hannah Petersen

摘要:

在偏离中心的重离子碰撞中,夸克-胶子等离子体(QGP)暴露在宇宙中有史以来最强的磁场中。由于QGP在高温下的顺磁性质,空间上不均匀的磁场配置施加各向异性力密度,其与纯几何效应产生的压力梯度竞争。在本文中,我们模拟了(3+1)维理想流体动力学与外部磁场估计的影响,这种力的密度对各向异性膨胀的QGP碰撞在RHIC和在LHC。虽然对于快速衰减的磁场可以忽略不计,但我们发现,长寿命的场产生了大量的力密度,在LHC能量下抑制等离子体的动量各向异性高达$20\%$,并且还在带电π介子的椭圆流$v_2$上留下了印记。

英文摘要:

In off-central heavy-ion collisions, the quark-gluon plasma (QGP) is exposed to the strongest magnetic fields ever created in the universe. Due to the paramagnetic nature of the QGP at high temperatures, the spatially inhomogeneous magnetic field configuration exerts an anisotropic force density that competes with the pressure gradients resulting from purely geometric effects. In this paper, we simulate (3+1)-dimensional ideal hydrodynamics with external magnetic fields to estimate the effect of this force density on the anisotropic expansion of the QGP in collisions at RHIC and at the LHC. While negligible for quickly decaying magnetic fields, we find that long-lived fields generate a substantial force density that suppresses the momentum anisotropy of the plasma by up to $20\%$ at the LHC energy, and also leaves its imprint on the elliptic flow $v_2$ of charged pions.

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