The relativistic KMS condition for the thermal n-point functions of the
P(φ)_2 model [PDF]
Christian D. Jäkel, Florian Robl
Thermal quantum field theories are expected to obey a relativistic KMS condition, which replaces both the relativistic spectrum condition of Wightman quantum field theory and the KMS condition, which characterises equilibrium states in quantum statistical mechanics. In a previous work it has been shown that the two-point function of the thermal $P(\phi)_2$ model satisfies the relativistic KMS condition. Here we extend this result to general $n$-point functions.
View original: http://arxiv.org/abs/1103.3609
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