The relations between the imaginary-time periodicity and the thermal Bogoliubov transformation inŋ-ξfield theory are discussed.It has been shown that the thermal Bogoliubov transformation leads to the imaginary-time periodicity of the Green function inŋ-ξspacetime and to the KMS condition.
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机译：Imaginary-time correlation function thermometry: A new, high-accuracy and model-free temperature analysis technique for x-ray Thomson scattering data
