Spectral representation of the shear viscosity for local scalar QFTs at finite temperature

• Verfasst von: Lowdon, Peter [VerfasserIn]
• Verfasst von: Tripolt, Ralf-Arno [VerfasserIn]
• Verfasst von: Pawlowski, Jan M. [VerfasserIn]
• Verfasst von: Rischke, Dirk H. [VerfasserIn]
• Titel: Spectral representation of the shear viscosity for local scalar QFTs at finite temperature
• Verf.angabe: Peter Lowdon, Ralf-Arno Tripolt, Jan M. Pawlowski, and Dirk H. Rischke
• E-Jahr: 2021
• Jahr: 13 September 2021
• Umfang: 13 S.
• Fussnoten: Gesehen am 05.11.2021
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Ridge, NY : American Physical Society, 2016
• Jahr Quelle: 2021
• Band/Heft Quelle: 104(2021), 6, Artikel-ID 065010, Seite 1-13
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.104.065010
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1776280504

Abstract

In local scalar quantum field theories at finite temperature correlation functions are known to satisfy certain nonperturbative constraints, which for two-point functions in particular implies the existence of a generalization of the standard Källén-Lehmann representation. In this work, we use these constraints in order to derive a spectral representation for the shear viscosity arising from the thermal asymptotic states, η0. As an example, we calculate η0 in ϕ4 theory, establishing its leading behavior in the small and large coupling regimes.