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arXiv 2105.05855hep-phcond-mat.str-elhep-thnucl-exnucl-th
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手征磁效应足够快吗?

Is the Chiral Magnetic Effect fast enough?

Jewel K. Ghosh, Sebastian Grieninger, Karl Landsteiner, Sergio Morales-Tejera

摘要:

这取决于:虽然我们发现在全息技术中,对撞机能量的磁场的寿命,如在RHIC实现的时间足够长,以建立手征磁流,在大型强子对撞机的磁场的寿命似乎太短。研究了强耦合全息规范理论中手征磁效应的实时演化。我们考虑了磁场对几何形状的反作用,并监测了压力和手征磁流。我们的研究结果表明,一般来说,在小磁场的压力建立速度比手征磁电流,而在强磁场相反。在大的电荷,我们还发现,平衡显着延迟,由于长寿命的振荡。我们还将模型的参数与QCD参数进行了匹配,并从中吸取了可能与实现重离子碰撞中手征磁效应相关的经验。特别是,我们发现一个平衡时间约$\sim0.35$ FM/C的存在下的手性异常的等离子体温度为$T\sim300-400$兆电子伏。

英文摘要:

It depends: While we find within holography that the lifetime of the magnetic field for collider energies like the ones achieved at RHIC is long enough to build up the chiral magnetic current, the lifetime of the magnetic field at LHC seems to be too short. We study the real time evolution of the chiral magnetic effect out-of-equilibrium in strongly coupled holographic gauge theories. We consider the backreaction of the magnetic field onto the geometry and monitor pressure and chiral magnetic current. Our findings show that generically at small magnetic field the pressure builds up faster than the chiral magnetic current whereas at strong magnetic field the opposite is true. At large charge we also find that equilibration is delayed significantly due to long lived oscillations. We also match the parameters of our model to QCD parameters and draw lessons of possible relevance to the realization of the chiral magnetic effect in heavy ion collisions. In particular, we find an equilibration time of about $\sim0.35$ fm/c in presence of the chiral anomaly for plasma temperatures of order $T\sim300-400$ MeV.

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