1,632 research outputs found
QCD Flux Tubes and Anomaly Inflow
We apply the Callan-Harvey anomaly inflow mechanism to the study of QCD
(chromoelectric) flux tubes, quark (pair)-creation and chiral magnetic effect,
using new variables from the Cho-Faddeev-Niemi decomposition of the gauge
potential. A phenomenological description of chromoelectric flux tubes is
obtained by studying a gauged Nambu-Jona-Lasinio effective Lagrangian, derived
from the original QCD Lagrangian. At the quantum level, quark condensates in
the QCD vacuum may form a vortex-like structure in a chromoelectric flux tube.
Quark zero modes trapped in the vortex are chiral and lead to a two-dimensional
gauge anomaly. To cancel it an effective Chern-Simons coupling is needed and
hence a topological charge density term naturally appears.Comment: A few clarifications; Section 5 improved on chiral magnetic effect;
references added; to appear in Phys. Rev.
Anomaly Inflow and Membranes in QCD Vacuum
We study the membrane-like structure of topological charge density and its
fluctuations in the QCD vacuum. Quark zero modes are localized on the membranes
and the resultant gauge anomaly is cancelled by the gauge variation of a
Chern-Simons type effective action in the bulk via the anomaly inflow
mechanism. The coupling between brane fluctuations, described by the rotations
of its normal vector, and the Chern-Simons current provides the needed anomaly
inflow to the membrane. This coupling is also related to the axial U(1) anomaly
which can induce brane punctures, and consequently quark-antiquark annihilation
across the brane. As the Chern-Simons current has a long-range character,
together with membranes it might lead to a solution to the confinement problem.Comment: 8 pages, no figure, Xth Conference on Quark Confinement and the
Hadron Spectru
- …