Speaker
Kenji Fukushima
(The University of Tokyo)
Description
The chirally anomalous transport including the chiral magnetic effect seems to get established from the theoretical side, but some theorists address serious concerns about the physical interpretation of $\langle\Omega|\boldsymbol{j}|\Omega\rangle$. In my talk I will emphasize how the conventional scenario can be verified from the dynamical process of the particle production.
If $|\Omega\rangle$ is an equilibrated static state, a current which is a real-time phenomenon, cannot flow and $\langle\Omega|\boldsymbol{j}|\Omega\rangle$ is not a current but should be a polarization. Such an interpretation is manifest for the chiral separation effect. Besides, in a quick derivation of the chiral magnetic effect using the Chern-Simons-Maxwell theory, the anomalous current appears in the same way as the Maxwell's displacement current, and we all know that the displacement current is a source of the magnetic field but there is no flow of electric carriers. Logically, it is possible that $\langle\Omega|\boldsymbol{j}|\Omega\rangle$ is also such a current containing no flow of charged particles, which is actually the case if the chiral magnetic current is formulated in the chiral perturbation theory.
I would however, emphasize that the genuine current generation occurs at the same time as the particle production with glasma flux tubes that locally violate P- and CP-symmetries together with an external magnetic field. The distribution function in momentum space is dynamically determined by microscopic processes of the particle production and I will present some results from the numerical simulation. A non-trivial observation found in the numerical simulation includes a quantitative estimate of the response time of the system until the anomalous current starts growing up after the switch-on of the background fields, which has a practically important implication for the detection of the physical observables sensisive to the chrally anomalous transport in experiments.
Primary author
Kenji Fukushima
(The University of Tokyo)
