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Study of the Magnitude-Redshift Relation for type Ia Supernovae in a Model resulting from a Ricci-Symmetry | R. G. Vishwakarma
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6 Jun 2001 | Journal: | Gen.Rel.Grav. 33 (2001) 1973-1984 | Subject: | gr-qc astro-ph | Abstract: | Models 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 | Services: | Forum | Review | PDF | Favorites |
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