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Construction of KMS States in Perturbative QFT and Renormalized Hamiltonian Dynamics

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An Erratum to this article was published on 20 July 2016

Abstract

We present a general construction of KMS states in the framework of perturbative algebraic quantum field theory (pAQFT). Our approach may be understood as an extension of the Schwinger–Keldysh formalism. We obtain in particular the Wightman functions at positive temperature, thus solving a problem posed some time ago by Steinmann (Commun Math Phys 170:405–416, 1995). The notorious infrared divergences observed in a diagrammatic expansion are shown to be absent due to a consequent exploitation of the locality properties of pAQFT. To this avail, we introduce a novel, Hamiltonian description of the interacting dynamics and find, in particular, a precise relation between relativistic QFT and rigorous quantum statistical mechanics.

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Authors and Affiliations

  1. II. Institute for Theoretical Physics, University of Hamburg, Hamburg, Germany

    Klaus Fredenhagen & Falk Lindner

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  1. Klaus Fredenhagen
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  2. Falk Lindner
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Correspondence to Klaus Fredenhagen.

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Communicated by M. Salmhofer

Dedicated to the memory of Othmar Steinmann $${^*27.11.1932 \quad ^\dagger 11.03.2012}$$ ∗ 27.11 . 1932 † 11.03 . 2012

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Fredenhagen, K., Lindner, F. Construction of KMS States in Perturbative QFT and Renormalized Hamiltonian Dynamics. Commun. Math. Phys. 332, 895–932 (2014). https://doi.org/10.1007/s00220-014-2141-7

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