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arXiv · 2308.14829

Real-time dynamics of axial charge and chiral magnetic current in a non-Abelian expanding plasma

Sebastian Grieninger·Sergio Morales-Tejera
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Abstract

Understanding axial charge dynamics driven by changes in Chern-Simons number densities is a key aspect in understanding the chiral magnetic effect (CME) in heavy-ion collisions. Most phenomenological simulations assume that a large amount of axial charge is produced in the initial stages and that axial charge is conserved throughout the simulation. Within an (expanding) homogeneous holographic plasma, we investigate the real-time axial charge relaxation dynamics and their impact on the chiral magnetic current. Moreover, we discuss the real-time interplay of the non-Abelian and the Abelian chiral anomaly in the presence of a strong magnetic field. In the expanding plasma, the Chern-Simons diffusion rate and thus the axial charge relaxation rate are time dependent due to the decaying magnetic field. We quantify the changes in the late time falloffs and establish a horizon formula for the chiral magnetic current.

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Sebastian Grieninger, Sergio Morales-Tejera. 2023-08-28. Real-time dynamics of axial charge and chiral magnetic current in a non-Abelian expanding plasma. https://doi.org/10.1103/physrevd.108.126010

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