Abstract
In Thermal Field Dynamics, thermal states are obtained from restrictions of vacuum states on a doubled field algebra. It is shown that the suitably doubled Fock representations of the Heisenberg algebra do not need to be introduced by hand but can be canonically handed down from deformations of the extended Heisenberg bialgebra. The relationship between quantum symmetries and doublings is discussed.
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Kopf, T., Santana, A.E. & Khanna, F.C. Quantum symmetries and thermal field dynamics. Czechoslovak Journal of Physics 48, 1401–1405 (1998). https://doi.org/10.1023/A:1021609306957
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DOI: https://doi.org/10.1023/A:1021609306957