Speaker
Dr
Waseem Kamleh
(University of Adelaide)
Description
We reveal a fundamental connection between centre
vortices and several key features associated with dynamical
chiral symmetry breaking and quark confinement. Calculations are
performed in pure $\mathrm{SU}(3)$ gauge theory using the chiral
overlap fermion action. Starting from the original gauge field, a
vortex identification procedure yields vortex-removed and vortex-only
backgrounds. By studying the quark mass function, we demonstrate the
removal of dynamical mass generation via the removal of the
centre-vortex degrees of freedom from the gauge fields. The low-lying
hadron mass spectrum is also calculated, with results that are
consistent with the restoration of chiral symmetry on vortex-removed
backgrounds at light quark masses.
Remarkably, we observe that the vortex-only degrees of freedom are
able to encapsulate the qualitative features of the original gauge
fields. Through visualisations of the topological charge density, we
find evidence of a link between centre vortices and the instanton
structure of the vacuum, specifically vortex-only backgrounds provide
gauge-field degrees of freedom sufficient to create instantons upon
cooling. Furthermore, after some smoothing, we observe dynamical mass
generation on the vortex-only backgrounds consistent with that of the
original gauge-field ensemble.
Primary author
Dr
Waseem Kamleh
(University of Adelaide)
