Analysis of the Phase Structure of Thermal QED/QCD through the HTL Improved Ladder Dyson-Schwinger Equation --On the Gauge Dependence of the Solution--
| dc.creator | Nakkagawa, Hisao | |
| dc.creator | Yokota, Hiroshi | |
| dc.creator | Yoshida, Koji | |
| dc.date | 2007-09-04 | |
| dc.date.accessioned | 2026-07-07T08:27:25Z | |
| dc.date.available | 2026-07-07T08:27:25Z | |
| dc.description | We solved with a numerical procedure the HTL improved ladder DS equation for the retarded fermion self-energy function $Σ_R$ to study the spontaneous generation of fermion mass in thermal QCD/QED, and studied the gauge-dependence of the solution within a general covariant gauge where the gauge parameter $ξ$ is any constant number. With the numerical solutions thus obtained, we found the followings; i) The fermion wave function renormalization function $A(P)$ always deviates largely from unity even at the momentum where the mass is defined, thus the corresponding solutions explicitly contradict with the Ward-Takahashi identity. ii) As a result, the obtained solutions strongly depend on the choice of gauge parameters: the critical temperatures and the critical coupling constants significantly change gauge by gauge. In all gauges we studied in the present analysis, we could not find any solution, having a possibility to be consistent with the Ward-Takahashi identity. Thus we are forced to investigate the procedure to find a gauge which enables us to get a solution being consistent with the Ward-Takahashi identity, otherwise we can not obtain any physically sensible conclusions through the analysis of the point-vertex ladder DS equation no matter how the gauge propagator gets improved. | |
| dc.description | 14 pages, 5 figures, PTPTeX.cls | |
| dc.identifier | https://arxiv.org/abs/0709.0323 | |
| dc.identifier | http://arxiv.org/abs/0709.0323 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/137266 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Analysis of the Phase Structure of Thermal QED/QCD through the HTL Improved Ladder Dyson-Schwinger Equation --On the Gauge Dependence of the Solution-- | |
| dc.type | text |