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Luminosities of high-redshift objects in an accelerating universe
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
1999 (English)Report (Other academic)
Abstract [en]

The results from the Supernova Cosmology Project indicate a relation between cosmic distance and redshift that corresponds to an accelerating Universe, and, as a consequence, the presence of an energy component with negative pressure. This necessitates a re-evaluation of such astrophysical luminosities that have been derived through conventional redshift analyses of, e.g., gamma-ray bursts and quasars. We have calculated corrected luminosity distances within two scenarios; the standard one with a non-zero cosmological constant, and the more recently proposed ``quintessence'', with a slowly evolving energy-density component. We find luminosity corrections from +30 to -40 per cent for redshifts with $z=0 - 10$. This finding implicates that the SCP data do not, by themselves, require a revision of the current, rather qualitative modeling of gamma-ray bursts and quasar properties.

Place, publisher, year, edition, pages
1999. , 4 p.
Research subject
URN: urn:nbn:se:ltu:diva-21800Local ID: 035f2ca0-eb58-11db-88eb-000ea68e967bOAI: diva2:994848
Godkänd; 1999; 20070415 (ysko)Available from: 2016-09-29 Created: 2016-09-29Bibliographically approved

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Fredriksson, SverkerHansson, Johan
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