Dr Ho-Ung Yee (SUNY, Stony Brook)
We consider relativistic QCD plasma containing charged chiral fermions in an external magnetic field, e.g a chirally symmetric quark-gluon plasma created in relativistic heavy ion collisions. In the presence of net axial charges, there is an induced electromagnetic current along the magnetic field due to triangle anomaly: this is Chiral Magnetic Effect (CME). We discuss CME in several complementary approaches. We show that triangle anomalies also imply the existence of a new type of collective gapless excitation in this system that stems from the coupling between the density waves of the electric and chiral charges; we call it "the Chiral Magnetic Wave" (CMW). The CMW exists even in a neutral plasma, i.e. in the absence of the axial and vector chemical potentials. We demonstrate the existence of CMW and study its properties using several different approaches. We also discuss the phenomenological implications of the CMW for heavy ion collisions; CMW can induce a charge-dependent elliptic flow for pions, which may be observed experimentally.