A study of angular size redshift relation for models in which Lambda decays as the energy density - INSPIRE

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A study of angular size redshift relation for models in which Lambda decays as the energy density

R.G. Vishwakarma
(
- IUCAA, Pune
)

Dec, 1999

13 pages

Published in:

Class.Quant.Grav. 17 (2000) 3833-3842

e-Print:

gr-qc/9912105 [gr-qc]

DOI:

10.1088/0264-9381/17/18/317

Report number:

IUCAA-28-2000

View in:

ADS Abstract Service

reference search113 citations

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Abstract: (arXiv)

By modifying the Chen and Wu ansatz, we have investigated some Friedmann models in which

\Lambda

varies as

\rho

. In order to test the consistency of the models with observations, we study the angular size - redshift relation for 256 ultracompact radio sources selected by Jackson and Dodgson. The angular sizes of these sources were determined by using very long-baseline interferometry in order to avoid any evolutionary effects. The models fit the data very well and require an accelerating universe with a positive cosmological constant. Open, flat and closed models are almost equally probable, though the open model provides a comparatively better fit to the data. The models are found to have intermediate density and imply the existence of dark matter, though not as much as in the canonical Einstein-de Sitter model.

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