Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2005-12-29
Int.J.Mod.Phys.D15:1163-1174,2006
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
LaTeX, 12 pages, 3 figs. In the replaced version figures are added and some errors are corrected
Scientific paper
10.1142/S0218271806008772
We consider a cosmological model with a variable gravitational constant, G, based on a scalar-tensor theory. Using the recent observational data for the Hubble diagram of type Ia supernovae (SNeIa) we find a phenomenological expression describing the variation of G. The corresponding variation of the fine structure constant \alpha within multidimensional theories is also computed and is shown not to support known constraints on \Delta \alpha / \alpha.
Garcia-Berro Enrique
Isern Jordi
Kubyshin Yu. A.
Lorén-Aguilar Pablo
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