Bayesian analysis of quark spectral properties from the Dyson-Schwinger equation

• Verfasst von: Fischer, Christian S. [VerfasserIn]
• Verfasst von: Pawlowski, Jan M. [VerfasserIn]
• Verfasst von: Rothkopf, Alexander [VerfasserIn]
• Verfasst von: Welzbacher, Christian A. [VerfasserIn]
• Titel: Bayesian analysis of quark spectral properties from the Dyson-Schwinger equation
• Verf.angabe: Christian S. Fischer, Jan M. Pawlowski, Alexander Rothkopf and Christian A. Welzbacher
• E-Jahr: 2018
• Jahr: 6 July 2018
• Umfang: 19 S.
• Fussnoten: Gesehen am 24.04.2020
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2018
• Band/Heft Quelle: 98(2018,1) Artikel-Nummer 014009, 19 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.98.014009
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 169604667X

Abstract

We report results on the quark spectral function in the Landau gauge at - finite temperature, determined from its Dyson-Schwinger equation. - Compared to earlier quenched results, this study encompasses unquenched - Nf=2 +1 fermion flavors in the medium. For the computation of - real-time spectra, we deploy the recent Bayesian Reconstruction (BR) - method and develop a new prior in order to better assess the inherent - systematic uncertainties. We identify the quark quasiparticle spectrum - and analyze the (non)appearance of zero modes at or around the - pseudocritical temperature. In both, the fully unquenched system and a - simpler truncation, using a model for the gluon propagator, we observe a - characteristic two-peak structure at zero three-momentum. The - temperature dependence of these structures, in case of the gluon - propagator model, is different than observed in previous studies. For - the back-coupled and unquenched case, we find interesting modifications - at and around the pseudocritical transition temperature.