Second order transport coefficient from the chiral anomaly at weak coupling: Diagrammatic resummation
journal contributionposted on 17.02.2016, 00:00 by A. Jimenez-Alba, H-U Yee
We compute one of the second order transport coefficients arising from the chiral anomaly in a hightemperature weakly coupled regime of quark-gluon plasma. This transport coefficient is responsible for the CP-odd current that is proportional to the time derivative of the magnetic field, and can be considered as a first correction to the chiral magnetic conductivity at finite, small frequency. We observe that this transport coefficient has a nonanalytic dependence on the coupling as ∼1=ðg4 logð1=gÞÞ at the weak coupling regime, which necessitates a resummation of infinite ladder diagrams with leading pinch singularities to get a correct leading log result, a feature quite similar to what one finds in the computation of electric conductivity. We formulate and solve the relevant CP-odd Schwinger-Dyson equation in real-time perturbation theory that reduces to a coupled set of second order differential equations at leading log order. Our result for this second order transport coefficient indicates that chiral magnetic current has some resistance to the time change of the magnetic field; this shall be called the “chiral induction effect.” We also discuss the case of color current induced by a color magnetic field.