Aspects of quarks in exotic matter
1999 (English)Licentiate thesis, comprehensive summary (Other academic)
In this licentiate thesis, two different aspects of particle physics have been studied. The results are presented in four papers. In papers I and II, a model for a joint origin of gamma-ray bursts and dark matter is presented. The common denominator is the deconfined state of quarks, the Quark-Gluon Plasma (QGP). We propose that such quark objects surviving the quark-hadron transition in the early universe, constitute the dark matter and that mergers of these objects are the inner engine of gamma-ray bursts. We have computed stability criteria for macroscopic quark objects, as well as the merger frequency assuming a lognormal distribution in size. In paper III, the helicity amplitudes for rare-meson production invirtual gamma-gamma collisions are computed. We show that it is possible to apply a generalised version of the Brodsky-Lepage scheme for exclusive processes in QCD, when computing these amplitudes. In paper IV, we analyse consequences of the new supernova data, suggesting a non-zero vacuum energy density in the universe. We calculate the intrinsic luminosity correction for high-redshift objects such as gamma-ray bursts and quasars. Two different extensions of the Friedmann-Robertson-Walker universe are used; a non-zero cosmological constant and a time-dependent spatially inhomogeneous energy density component (so-called quintessence). The results show a correction of up to 30% for the conventionally computed luminosities.
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 1999.
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757 ; 1999:60
Research subject Fysik
IdentifiersURN: urn:nbn:se:ltu:diva-16915Local ID: 0a74d6b0-d7ea-11db-a1bf-000ea68e967bOAI: oai:DiVA.org:ltu-16915DiVA: diva2:989903
Godkänd; 1999; 20070321 (ysko)2016-09-292016-09-292016-10-19Bibliographically approved