Thermal quantum field theory
METHODS TO CALCULATE EXPECTATION VALUES OF PHYSICAL OBSERVABLES OF A QUANTUM FIELD THEORY AT FINITE TEMPERATURE
Finite temperature field theory; Thermal field theory; Finite Temperature Field Theory; Thermo field dynamics
In theoretical physics, thermal quantum field theory (thermal field theory for short) or finite temperature field theory is a set of methods to calculate expectation values of physical observables of a quantum field theory at finite temperature.