Büscher, Pascal (2014)
Phase diagram of two-color QCD in a Dyson-Schwinger approach.
Technische Universität Darmstadt
Dissertation, Erstveröffentlichung
Kurzbeschreibung (Abstract)
We investigate two-color QCD with two flavors at finite temperatures and chemical potentials using a Dyson-Schwinger approach. We employ two different truncations for the quark loop in the gluon DSE: one based on the Hard-Dense/Hard-Thermal Loop (HDTL) approximation of the quark loop and one based on the back-coupling of the full, self-consistent quark propagator (SCQL). We compare results for the different truncations with each other as well as with other approaches.
As expected, we find a phase dominated by the condensation of quark-quark pairs. This diquark condensation phase overshadows the critical end point and first-order phase transition which one finds if diquark condensation is neglected. The phase transition from the phase without diquark condensation to the diquark-condensation phase is of second order. We observe that the dressing with massless quarks in the HDTL approximation leads to a significant violation of the Silver Blaze property and to a too small diquark condensate. The SCQL truncation, on the other hand, is found to reproduce all expected features of the µ-dependent quark condensates. Moreover, with parameters adapted to the situation in other approaches, we also find good to very good agreement with model and lattice calculations in all quark quantities. We find indictions that the physics in recent lattice calculations is likely to be driven solely by the explicit chiral symmetry breaking. Discrepancies w.r.t. the lattice are, however, observed in two quantities that are very sensitive to the screening of the gluon propagator, the dressed gluon propagator itself and the phase-transition line at high temperatures.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2014 | ||||
Autor(en): | Büscher, Pascal | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Phase diagram of two-color QCD in a Dyson-Schwinger approach | ||||
Sprache: | Englisch | ||||
Referenten: | Wambach, Prof. Jochen ; Buballa, PD Michael | ||||
Publikationsjahr: | 2014 | ||||
Datum der mündlichen Prüfung: | 28 April 2014 | ||||
URL / URN: | http://tuprints.ulb.tu-darmstadt.de/3928 | ||||
Kurzbeschreibung (Abstract): | We investigate two-color QCD with two flavors at finite temperatures and chemical potentials using a Dyson-Schwinger approach. We employ two different truncations for the quark loop in the gluon DSE: one based on the Hard-Dense/Hard-Thermal Loop (HDTL) approximation of the quark loop and one based on the back-coupling of the full, self-consistent quark propagator (SCQL). We compare results for the different truncations with each other as well as with other approaches. As expected, we find a phase dominated by the condensation of quark-quark pairs. This diquark condensation phase overshadows the critical end point and first-order phase transition which one finds if diquark condensation is neglected. The phase transition from the phase without diquark condensation to the diquark-condensation phase is of second order. We observe that the dressing with massless quarks in the HDTL approximation leads to a significant violation of the Silver Blaze property and to a too small diquark condensate. The SCQL truncation, on the other hand, is found to reproduce all expected features of the µ-dependent quark condensates. Moreover, with parameters adapted to the situation in other approaches, we also find good to very good agreement with model and lattice calculations in all quark quantities. We find indictions that the physics in recent lattice calculations is likely to be driven solely by the explicit chiral symmetry breaking. Discrepancies w.r.t. the lattice are, however, observed in two quantities that are very sensitive to the screening of the gluon propagator, the dressed gluon propagator itself and the phase-transition line at high temperatures. |
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URN: | urn:nbn:de:tuda-tuprints-39285 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik | ||||
Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Kernphysik |
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Hinterlegungsdatum: | 20 Jul 2014 19:55 | ||||
Letzte Änderung: | 20 Jul 2014 19:55 | ||||
PPN: | |||||
Referenten: | Wambach, Prof. Jochen ; Buballa, PD Michael | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 28 April 2014 | ||||
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