Center vortices and the quark propagator in SU(2) gauge theory
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(Published version)
Date
2008
Authors
Bowman, P.
Langfeld, K.
Leinweber, D.
Cass, A.
Sternbeck, A.
Von Smekal, L.
Williams, A.
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Journal article
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Physical Review D: Particles, Fields, Gravitation and Cosmology, 2008; 78(5):054509-1-054509-7
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Patrick O. Bowman, Kurt Langfeld, Derek B. Leinweber, Alan O' Cais, Andre Sternbeck, Lorenz von Smekal and Anthony G. Williams
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Abstract
We study the behavior of the AsqTad quark propagator in Landau gauge on quenched SU(2) gauge configurations under the removal of center vortices. In contrast to recent results in SU(3), we clearly see the infrared enhancement of the mass function disappear if center vortices are removed, a sign of the intimate relation between center vortices and chiral symmetry breaking in SU(2) gauge-field theory. These results provide a benchmark with which to interpret the SU(3) results. In addition, we consider vortex-only configurations. On those, the quark dressing function behaves roughly as on the full configurations, and the mass function picks up an almost linear momentum dependence.
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©2008 American Physical Society