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am finally adding references here, such as
will add these also to lattice gauge theory as far as there is overlap
added bried paragraph on relation to thermal quantum field theory and “compact periodic Euclidean time”, added some more references. But of course it remains a stub.
made, for the moment, various keywords redirect here, which should eventually be split off as entries in their own right: thermal quantum field theory, Matsubara formalism, KMS condition
added further pointers regarding thermal field theory as time-periodic Euclidean field theory. Of the many reviews, this one here stands out in clarity, coherence and scope:
further exanded the Idea-section a fair bit and added more references, such as on literature explicitly discussing the Osterwalder-Schrader theorem for compact Euclidean time:
Will copy relvant bits also to the entries Wick rotation and Osterwalder-Schrader theorem
added the following pointer:
The perturbative expansion of thermal field theory around the infinite-temperature-limit (i.e. around $\beta = 1/T = 0$) is discussed in
added two more reference on the perturbation around the infinite-temperature limit:
Klaas Landsman, Limitations to dimensional reduction at high temperature, Nuclear Physics B Volume 322, Issue 2, 14 August 1989, Pages 498-530 (doi:10.1016/0550-3213(89)90424-0)
T. Reisz, Realization of dimensional reduction at high temperature, Z. Phys. C - Particles and Fields (1992) 53: 169 (doi:10.1007/BF01483886)
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