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28 March 2024
 
  » arxiv » gr-qc/0106021

 Article overview


Study of the Magnitude-Redshift Relation for type Ia Supernovae in a Model resulting from a Ricci-Symmetry
R. G. Vishwakarma ;
Date 6 Jun 2001
Journal Gen.Rel.Grav. 33 (2001) 1973-1984
Subject gr-qc astro-ph
AbstractModels with a dynamic cosmological term Lambda (t) are becoming popular as they solve the cosmological constant problem in a natural way. Instead of considering any ad-hoc assumption for the variation of Lambda, we consider a particular symmetry, the contracted Ricci-collineation along the fluid flow, in Einstein’s theory. We show that apart from having interesting properties, this symmetry does require Lambda to be a function of the scale factor of the Robertson-Walker metric. In order to test the consistency of the resulting model with observations, we study the magnitude-redshift relation for the type Ia supernovae data from Perlmutter et al. The data fit the model very well and require a positive non-zero Lambda and a negative deceleration parameter. The best-fitting flat model is obtained as Omega_0 approx 0.5 with q_0 approx -0.2.
Source arXiv, gr-qc/0106021
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