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Pregled bibliografske jedinice broj: 18350

Out of equilibrium thermal field theories-elimination of pinching singularities


Dadić, Ivan
Out of equilibrium thermal field theories-elimination of pinching singularities // Proceedings of the Eleventh Chris Engelbrecht Summer School in Theoretical Physics / Cleymans, J. ; Geyer, H.B. ; Scholtz, F.G. (ur.).
Heidelberg: Springer, 1998. str. 204-234 (pozvano predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)


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, 04-14.02.1998

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


Projekt / tema
00980102

Ustanove
Institut "Ruđer Bošković", Zagreb

Autor s matičnim brojem:
Ivan Dadić, (8846)