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Reconstructing the thermal Green functions at real times from those at imaginary times

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Cuniberti, Gianaurelio ; Micheli, Enrico De ; Viano, Giovanni Alberto
Date of publication of this fulltext: 05 Aug 2009 13:31


By exploiting the analyticity and boundary value properties of the thermal Green functions that result from the KMS condition in both time and energy complex variables, we treat the general (non-perturbative) problem of recovering the thermal functions at real times from the corresponding functions at imaginary times, introduced as primary objects in the Matsubara formalism. The key property on ...


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