However, the theoretical framework of this zero-temperature theory does not naturally incorporate effects of the medium relevant at high temperatures and densities. This treatment has historically been extremely successful in describing the behaviour of all the known particles that constitute the Standard Model of particle physics. The standard theoretical treatment of fundamental fields and their interactions primarily uses the language of quantum field theory (QFT), see for example. These results demonstrate the importance of thermal effects in particle decay observables relevant in many phenomenological applications in systems at high temperatures and densities.
In addition, a (pseudo)scalar emission off a fermion line is also discussed. These processes are extended from earlier works to include chemical potentials and distinct species in the final state. Processes considered here are those of a neutral (pseudo)scalar decaying into two distinct (pseudo)scalars or into a fermion-antifermion pair. As phenomenologically relevant implications, we present a compendium of thermal decay rates for several typical reactions calculated within the framework of the real-time formalism and compared to the imaginary-time results found in the literature.
We start with a general pedagogical introduction into the TFT in the imaginary- and real-time formulation. This review represents a detailed and comprehensive discussion of the Thermal Field Theory (TFT) concepts and key results in Yukawa-type theories.
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