PhysRevD.88.025030.pdf (565.67 kB)

Out-of-equilibrium chiral magnetic effect at strong coupling

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journal contribution
posted on 05.01.2016, 00:00 by Shu Lin, Ho-Ung Yee
We study the charge transports originating from triangle anomaly in out-of-equilibrium conditions in the framework of AdS/CFT correspondence at strong coupling, to gain useful insights on possible charge separation effects that may happen in the very early stages of heavy-ion collisions. We first construct a gravity background of a homogeneous mass shell with a finite (axial) charge density gravitationally collapsing to a charged black hole, which serves as a dual model for out-of-equilibrium charged plasma undergoing thermalization. We find that a finite charge density in the plasma slows down the thermalization. We then study the out-of-equilibrium properties of chiral magnetic effect and chiral magnetic wave in this background. As the medium thermalizes, the magnitude of chiral magnetic conductivity and the response time delay grow. We find a dynamical peak in the spectral function of retarded current correlator, which we identify as an out-of-equilibrium chiral magnetic wave. The group velocity of the out-of-equilibrium chiral magnetic wave is shown to receive a dominant contribution from a nonequilibrium effect, making the wave moving much faster than in the equilibrium, which may enhance the charge transports via triangle anomaly in the early stage of heavy-ion collisions.

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© 2013 by American Physical Society, Physical Review D. The final publication is available at http://prd.aps.org/ doi: 10.1103/PhysRevD.88.025030

Publisher

American Physical Society

Language

en_US

issn

1550-7998

Issue date

01/07/2013

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