Out of equilibrium thermal field theories-elimination of pinching singularities (CROSBI ID 467670)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Dadić, Ivan
engleski
Out of equilibrium thermal field theories-elimination of pinching singularities
We analyze ill-defined pinch singularities characteristic of out of equilibrium thermal field theories. We identify two mechanisms that eliminate pinching even at the single self-energy insertion approximation to the propagator: the first is based on the vanishing of phase space at the singular point (threshold effect). It is effective in QED with a massive electron and a massless photon. In massless QCD, this mechanism fails, but the pinches cancel owing to the second mechanism, i.e., owing to the spinor/tensor structure of the single self-energy insertion contribution to the propagator. The constraints imposed on distribution functions are very reasonable.The same mechanism eliminates pinching from the resummed Schwinger-Dyson series.
pinching singularity; out of equilibrium; thermal field theory
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Podaci o prilogu
204-234-x.
1998.
objavljeno
Podaci o matičnoj publikaciji
Cleymans, J. ; Geyer, H.B. ; Scholtz, F.G.
Heidelberg: Springer
Podaci o skupu
The Eleventh Chris Engelbrecht Summer School in Theoretical Physics
pozvano predavanje
04.02.1998-14.02.1998
Cape Town, Južnoafrička Republika