TY  - JOUR
A1  - Lowdon, Peter
A1  - Tripolt, Ralf-Arno
A1  - Pawlowski, Jan M.
A1  - Rischke, Dirk-Hermann
T1  - Spectral representation of the shear viscosity for local scalar QFTs at finite temperature
T2  - Physical review
N2  - 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.
KW  - Finite temperature field theory
KW  - Nonperturbative effects in field theory
KW  - Quantum field theory
Y1  - 2021
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/62730
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-627300
SN  - 2470-0029
N1  - The work of P. L. and D. H. R. is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through the Collaborative Research Center CRC-TR 211 “Strong-interaction matter under extreme conditions”—Project No. 315477589-TRR 211. R.-A. T. is supported by the Austrian Science Fund (FWF) through Lise Meitner Grant No. M 2908-N. The work of J. M. P is supported by the DFG under Germany’s Excellence Strategy Grant No. EXC 2181/1-390900948 (the Heidelberg STRUCTURES Excellence Cluster), and under the Collaborative Research Centre SFB 1225 (ISOQUANT), and the BMBF Grant No. 05P18VHFCA.
VL  - 104
IS  - 6, art. 5010
SP  - 1
EP  - 13
PB  - Inst.
CY  - Woodbury, NY
ER  -