Implications of a Nonzero Cosmological Constant and Luminosity Selection Effects on Cosmological Tests

Details Implications of a Nonzero Cosmological Constant and Luminosity Selection Effects on Cosmological Tests Implications of a Nonzero Cosmological Constant and Luminosity Selection Effects on Cosmological Tests

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aujph..51..585u&link_type=abstract

Australian Journal of Physics, vol. 51, p. 585

Astronomy and Astrophysics

Astrophysics

Astronomical Models, Cosmology, Universe, Red Shift, Quasars, Luminosity, Missing Mass (Astrophysics), Dynamic Stability, Field Theory (Physics), Background Radiation, Mass To Light Ratios

Scientific paper

This paper examines the implications of a nonzero cosmological constant Lambda0 on the amount of linear size evolution and the luminosity selection effects usually required in the interpretation of the angular diameter - redshift (Theta - Zeta) test. This is based on3 three typical cases chosen on various plausible assumptions which can be made concerning the contribution of lambda0 to the density of the universe (parametrized by Omega0. The results show a fairly strong linear size evolution will be required to interpret the theta-zeta data of extended steep spectrum quasars for all three cases, if luminosity effects are neglected. However, this evolution is significantly steeper in a matter-dominated universe with Omegam - Omega0 = 1, than in a flat universe, with OmegaLambda = 0.8, OmegaM = 0.2 and an open universe with OmegaM = 0.2, OmegaLambda = 0. Furthermore, when the luminosity selection effects present in the sample are considered, a milder size evolution is obtained for the OmegaM = 1, OmegaLambda = 0 model while little or no size evolution is found for the other two cases. There is therefore no significant difference in our results for a n open low density universe with OmegaLambda = 0 and a flat universe dominated by OmegaLambda predicted by inflation. The present results therefore imply that an open low density universe with OmegaM = 0.2 and OmegaLambda = 0 is compatible with an inflationary model of the universe with OmegaM = 0.2 and OmegaLambda = 0.8. This leads to a contradiction since the universe cannot be open and spatially closed at the same time (the existence of one should preclude the other).

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