Naslov
Out of equilibrium thermal field theories-elimination of pinching singularities

Autori
Dadić, Ivan

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the Eleventh Chris Engelbrecht Summer School in Theoretical Physics / Cleymans, J. ; Geyer, H.B. ; Scholtz, F.G. - Heidelberg : Springer, 1998, 204-234

Skup
The Eleventh Chris Engelbrecht Summer School in Theoretical Physics

Mjesto i datum
Cape Town, Južnoafrička Republika, 04.02.1998. - 14.02.1998

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
pinching singularity; out of equilibrium; thermal field theory

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA