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Vacuum-Energy and the Angular-Size/Redshift Diagram for Milliarcsecond Radio Sources

Published online by Cambridge University Press:  25 May 2016

J. C. Jackson  and
Marina Dodgson
J. C. Jackson
Affiliation:
Department of Mathematics and Statistics, University of Northumbria at Newcastle, Ellison Building, Newcastle upon Tyne, NE1 8ST, UK
Marina Dodgson
Affiliation:
Department of Mathematics and Statistics, University of Northumbria at Newcastle, Ellison Building, Newcastle upon Tyne, NE1 8ST, UK

Extract

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We have considered two compilations of angular-size/redshift data for ultra-compact radio sources, due to Kellerman (1993) and Gurvits (1994) respectively, and a family of homogeneous isotropic universes with two degrees of freedom, represented by pressure-free matter and vacuum-energy. Kellerman's results seem to support the canonical model q0 = 1/2, ω0 = 1; the question posed here is: can we produce significant deceleration without dark matter?

Type
Part II: Contributed Papers
Information
Symposium - International Astronomical Union , Volume 168: Examining the Big Bang and the Diffuse Background Radiations , 1996 , pp. 489 - 490
Copyright
Copyright © Kluwer 1996 

References

Gurvits, L.I., 1994, ApJ, 425, 442.CrossRefGoogle Scholar
Kellerman, K.I., 1993, Nature, 361, 134.Google Scholar
Jackson, J.C., 1992, QJRAS, 33, 17.Google Scholar