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thermal field theory Quantum field theory at nonzero temperatures. Thermal field theory is particularly useful in analyzing the sequence of phase transitions that is thought to have occurred in the early Universe.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
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TFD formalism is a thermal quantum field theory
[27-32] where the statistical average of an arbitrary operator is interpreted as the expectation value in a thermal vacuum.
Thermal quantum field theory
; algebraic aspects and applications.