eprintid: 1442
rev_number: 8
eprint_status: archive
userid: 1
dir: disk0/00/00/14/42
datestamp: 2001-03-15 00:00:00
lastmod: 2014-04-03 10:44:20
status_changed: 2012-08-14 15:01:14
type: doctoralThesis
metadata_visibility: show
creators_name: Isert, Dagmar Sigrun
title: Transport theory for scalar quarks and gluons
title_de: Transporttheorie für skalare Quarks und Gluonen
ispublished: pub
subjects: ddc-530
divisions: i-130300
adv_faculty: af-13
keywords: Pinchsingularitättransport theory , quark , gluon , pinch singularity
cterms_swd: Transporttheorie
cterms_swd: Quark
cterms_swd: Gluon
abstract_translated_text: In this work, we have detailed the calculations of the transport and constraint equations for a theory of scalar quarks and gluons with self-interactions.  Special care has been taken in particular in understanding how the transport  equation, taken on its own, leads to a Boltzmann-like equation when considered  in the quasiparticle approximation. Through the analysis of all self-energy  graphs that occur it is evident which role they play: certain graphs give rise  to the expected cross sections, while others serve to renormalize diagrams of  lower order scattering processes.  In the calculation of the transport equation, so-called pinch singularities arise in individual self-energy diagrams. We demonstrate explicitly how they cancel in equilibrium. For the case of non-equilibrium, several ansätze are investigated, but none of them leads to the cancellation of all pinch  singularities.  Finally, the constraint equation is considered. This leads to the introduction of a finite width into the propagators. The main advantage of this is that no pinch singularities can possibly occur. The disadvantage, however, is that the  calculations become very cumbersome and it is no longer straightforward to cast the  transport equation into a form which can be recognized as being Boltzmann-like.  
abstract_translated_lang: eng
class_scheme: pacs
class_labels: 11.10.Wx, 05.20.Dd, 12.38.Mh, 24.85.+p
date: 2001
date_type: published
id_scheme: DOI
id_number: 10.11588/heidok.00001442
ppn_swb: 1643196979
own_urn: urn:nbn:de:bsz:16-opus-14422
date_accepted: 2001-02-14
advisor: HASH(0x561a62954fb0)
language: eng
bibsort: ISERTDAGMATRANSPORTT2001
full_text_status: public
citation:   Isert, Dagmar Sigrun  (2001) Transport theory for scalar quarks and gluons.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/1442/1/arbeit.pdf