arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1802.09629hep-phnucl-th
收藏

热QCD物质中畴壁对手征磁效应的影响

The impact of domain walls on the chiral magnetic effect in hot QCD matter

Kirill Tuchin

摘要:

手征磁效应(CME)--夸克-胶子等离子体和其他拓扑非平凡介质中正电荷和负电荷沿外部磁场方向的分离--是电动力学与拓扑胶子场涨落耦合的结果,这些涨落形成亚稳$CP$奇畴。在唯象模型中,通常假设畴是均匀的,畴壁对电流流动的影响不是本质的。本文对后一种假设提出了质疑。本文提出了一个简单的模型,该模型由均匀球畴和均匀时变磁场组成。结果表明:(i)没有电流流入或流出畴,(ii)电荷分离电流,即沿外场方向在畴内流动的总电流,是耗散欧姆电流,(iii)CME效应既可以由反常电流产生,也可以由畴壁的边界条件产生;电荷分离电流在外电场衰减很久之后在等离子体中振荡。这些性质与无限介质中的日冕物质抛射性质不同。

英文摘要:

The Chiral Magnetic Effect (CME) -- the separation of positive and negative electric charges along the direction of the external magnetic field in quark-gluon plasma and other topologically non-trivial media -- is a consequence of the coupling of electrodynamics to the topological gluon field fluctuations that form metastable $CP$-odd domains. In phenomenological models it is usually assumed that the domains are uniform and the influence of the domain walls on the electric current flow is not essential. This paper challenges the latter assumption. A simple model consisting of a uniform spherical domain in a uniform time-dependent magnetic field is introduced and analytically solved. It is shown that (i) no electric current flows into or out of the domain, (ii) the charge separation current, viz. the total electric current flowing inside the domain in the external field direction, is a dissipative Ohm current, (iii) the CME effect can be produced either by the anomalous current or by the boundary conditions on the domain wall and (iv) the charge separation current oscillates in plasma long after the external field decays. These properties are qualitatively different from the CME in an infinite medium.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑