Jul 24 – 30, 2016
Highfield Campus, University of Southampton
Europe/London timezone

Centre vortices are the seeds of dynamical chiral symmetry breaking

Jul 29, 2016, 4:30 PM
Building 67 Room 1007 (Highfield Campus, University of Southampton)

Building 67 Room 1007

Highfield Campus, University of Southampton

Talk Vacuum Structure and Confinement Vacuum Structure and Confinement


Dr Waseem Kamleh (University of Adelaide)


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)

Presentation materials