Chiral magnetic wave at finite baryon density and the electric quadrupole moment of the quark-gluon plasma.
Chiral magnetic wave at finite baryon density and the electric quadrupole moment of the quark-gluon plasma.
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DOI：
10.1103/physrevlett.107.052303
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发表时间：
2011-03
影响因子：
8.6
通讯作者：
Y. Burnier;D. Kharzeev;J. Liao;Ho-Ung Yee
中科院分区：
文献类型：
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作者：
Y. Burnier;D. Kharzeev;J. Liao;Ho-Ung Yee
手征磁波是夸克-胶子等离子体在外部磁场存在下的无隙集体激发，源于手征磁效应和手征分离效应的相互作用;它由轴向异常耦合的电荷密度波和手征电荷密度波组成。我们考虑了有限重子密度下的手征磁波，发现它诱导了重离子碰撞中产生的夸克-胶子等离子体的电四极矩：产生的火球的“极”（指向反应平面外）获得额外的正电荷，“赤道”获得额外的负电荷.我们指出，这种电四极形变提升了正负π介子椭圆流之间的简并性，导致v（2）（π（+））
The chiral magnetic wave is a gapless collective excitation of quark-gluon plasma in the presence of an external magnetic field that stems from the interplay of chiral magnetic and chiral separation effects; it is composed of the waves of the electric and chiral charge densities coupled by the axial anomaly. We consider a chiral magnetic wave at finite baryon density and find that it induces the electric quadrupole moment of the quark-gluon plasma produced in heavy ion collisions: the "poles" of the produced fireball (pointing outside of the reaction plane) acquire additional positive electric charge, and the "equator" acquires additional negative charge. We point out that this electric quadrupole deformation lifts the degeneracy between the elliptic flows of positive and negative pions leading to v(2)(π(+))