Derivation of the real-time formalism from first principles in thermal field theory

1997 ◽  
Vol 75 (1) ◽  
pp. 155-166 ◽  
Author(s):  
Hubert Mabilat
Keyword(s):  
Field Theory ◽  
Real Time ◽  
Thermal Field Theory ◽  
First Principles ◽  
Thermal Field ◽  
The Real ◽  
Time Formalism ◽  
Real Time Formalism

scholarly journals Thermal Field Theory in real-time formalism: concepts and applications for particle decays

2021 ◽  
Vol 57 (2) ◽  
Author(s):  
Torbjörn Lundberg ◽  
Roman Pasechnik
Keyword(s):  
Field Theory ◽  
Real Time ◽  
Thermal Field Theory ◽  
Thermal Field ◽  
Distinct Species ◽  
Decay Rates ◽  
Fermion Line ◽  
Time Formalism ◽  
Pseudo Scalar ◽  
Real Time Formalism

AbstractThis review represents a detailed and comprehensive discussion of the Thermal Field Theory (TFT) concepts and key results in Yukawa-type theories. We start with a general pedagogical introduction into the TFT in the imaginary- and real-time formulation. 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. Processes considered here are those of a neutral (pseudo)scalar decaying into two distinct (pseudo)scalars or into a fermion-antifermion pair. These processes are extended from earlier works to include chemical potentials and distinct species in the final state. In addition, a (pseudo)scalar emission off a fermion line is also discussed. These results demonstrate the importance of thermal effects in particle decay observables relevant in many phenomenological applications in systems at high temperatures and densities.

THERMOFIELD DYNAMICS AND e+e- REACTIONS

2011 ◽  
Vol 26 (17) ◽  
pp. 2881-2897 ◽  
Author(s):  
M. CHEKERKER ◽  
M. LADREM ◽  
F. C. KHANNA ◽  
A. E. SANTANA
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Real Time ◽  
Finite Temperature ◽  
Quantum Field ◽  
Time Formalism ◽  
Hadronic State ◽  
Real Time Formalism

The thermofield dynamics, a real-time formalism for finite temperature quantum field theory, is used to calculate the rates for e+e- reactions at finite temperature. The results show the role of temperature in defining a hadronic state after the plasma has been cooled down.

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