The QCD Quark Propagator in Coulomb Gauge and - Institut für Physik
The QCD Quark Propagator in Coulomb Gauge and - Institut für Physik
The QCD Quark Propagator in Coulomb Gauge and - Institut für Physik
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Contents<br />
1 Prologue 1<br />
2 Chiral Symmetry Break<strong>in</strong>g <strong>in</strong> <strong>QCD</strong> 5<br />
2.1 Chiral symmetry of the <strong>QCD</strong> Lagrangian . . . . . . . . . . . . . . . . . . . 5<br />
2.2 Constituent <strong>and</strong> current quark mass . . . . . . . . . . . . . . . . . . . . . 8<br />
2.3 <strong>The</strong> pion as a Goldstone boson <strong>and</strong> PCAC . . . . . . . . . . . . . . . . . . 11<br />
3 Remarks on <strong>QCD</strong> <strong>in</strong> <strong>Coulomb</strong> <strong>Gauge</strong> 15<br />
3.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15<br />
3.2 <strong>Coulomb</strong> gauge <strong>and</strong> renormalisation . . . . . . . . . . . . . . . . . . . . . . 16<br />
3.3 Approaches <strong>in</strong> <strong>Coulomb</strong> gauge . . . . . . . . . . . . . . . . . . . . . . . . . 17<br />
3.4 Quantisation of Maxwell theory . . . . . . . . . . . . . . . . . . . . . . . . 19<br />
3.4.1 Canonical quantisation of Maxwell theory . . . . . . . . . . . . . . 20<br />
3.4.2 Path <strong>in</strong>tegral quantisation of Maxwell theory <strong>in</strong><br />
<strong>Coulomb</strong> gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24<br />
3.5 Quantisation of Yang-Mills theory . . . . . . . . . . . . . . . . . . . . . . . 25<br />
3.6 <strong>The</strong> conf<strong>in</strong>ement scenario of Gribov <strong>and</strong> Zwanziger . . . . . . . . . . . . . 28<br />
3.6.1 Ambiguities <strong>in</strong> <strong>Coulomb</strong> gauge . . . . . . . . . . . . . . . . . . . . . 28<br />
3.6.2 <strong>Coulomb</strong> conf<strong>in</strong>ement as a necessary conf<strong>in</strong>ement condition . . . . . 30<br />
3.6.3 <strong>Quark</strong>-antiquark potentials <strong>and</strong> signals for conf<strong>in</strong>ement . . . . . . . 32<br />
3.6.4 Conf<strong>in</strong>ement <strong>in</strong> <strong>Coulomb</strong> gauge . . . . . . . . . . . . . . . . . . . . 33<br />
4 <strong>The</strong> <strong>Quark</strong> Dyson-Schw<strong>in</strong>ger Equation 35<br />
4.1 From the <strong>QCD</strong> action to the gap equation . . . . . . . . . . . . . . . . . . 35<br />
4.2 <strong>The</strong> gap equation <strong>in</strong> <strong>Coulomb</strong> gauge . . . . . . . . . . . . . . . . . . . . . 37<br />
4.3 Considerations without transverse gluons . . . . . . . . . . . . . . . . . . . 40<br />
4.4 Numerical results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41<br />
4.5 Add<strong>in</strong>g transverse gluons <strong>and</strong> retardation . . . . . . . . . . . . . . . . . . . 43<br />
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