Abstract
Based on a holographic model incorporating both the chiral anomaly and the gravitational anomaly, we study the effect of magneto-vortical coupling on the transport properties of a strongly coupled plasma. The focus of present work is on the generation of a vector charge density and an axial current, as response to vorticity in a magnetized plasma. The transport coefficients parameterizing the vector charge density and axial current are calculated both analytically (in the weak magnetic field limit) and also numerically (for general values of the magnetic field). We find the generation of vector charge receives both non-anomalous and anomalous contributions, with the non-anomalous contribution dominating in the limit of a strong magnetic field and the anomalous contribution sensitive to both chiral anomaly and gravitational anomaly. On the contrary, we find the axial current is induced entirely due to the gravitational anomaly, thus we interpret the axial current generation as chiral vortical effect. The corresponding chiral vortical conductivity is found to be suppressed by the magnetic field. By the Onsager relation, these transport coefficients are responsible for the generation of a thermal current due to a transverse electric field or a transverse axial magnetic field, which we call the thermal Hall effect and the thermal axial magnetic effect, respectively.
Highlights
The effect of magnetic field and vorticity on QCD matter has attracted much attention over the past few years
When the QCD matter carries net vector charge or axial charge densities, the chiral anomaly and gravitational anomaly can induce a variety of anomalous transport phenomena such as the chiral magnetic effect (CME) [9,10,11], the chiral vortical effect (CVE) [12,13,14] and the chiral separation effect (CSE) [15,16]
In this work, based on a holographic model, we considered the effects of the magneto-vortical coupling on the transport properties of a strongly coupled plasma
Summary
The effect of magnetic field and vorticity on QCD matter has attracted much attention over the past few years. When the QCD matter carries net vector charge or axial charge densities, the chiral anomaly and gravitational anomaly can induce a variety of anomalous transport phenomena such as the chiral magnetic effect (CME) [9,10,11], the chiral vortical effect (CVE) [12,13,14] and the chiral separation effect (CSE) [15,16]. The interplay of a strong magnetic field and a vorticity was found to lead to new transport phenomena such as dynamical generation of a vector charge [17]; see [18,19,20,21].
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