Brans-Dicke model constrained from the Big Bang nucleosynthesis and magnitude redshift relations of supernovae
Department of Physics, Kyushu University, Fukuoka, 812-8581, Japan e-mail: [berni;riou;hashimoto]@phys.kyushu-u.ac.jp
2 Department of Physics, Kumamoto University, Kumamoto, 860-8555, Japan e-mail: email@example.com
Accepted: 12 July 2010
We investigated the Brans-Dicke model with a variable cosmological term () with the coupling constant ω = 104. We constrained the parameters inherent in this model from a comparison between the Big Bang nucleosynthesis and the observed abundances. Furthermore, we studied the magnitude redshift (m–z) relations for the BDΛ with and without another constant cosmological term in a flat universe. Observational data of type Ia supernovae (SNIa) are used in the redshift range of 0.01 < z < 2. We found that our model with an energy density of the constant cosmological term of 0.7 can explain the SNIa observations, though the model parameters are insensitive to the m–z relation.
Key words: primordial nucleosynthesis / dark energy / early Universe / cosmology: observations / dark matter / cosmology: theory
© ESO, 2010