Brane cosmologies help out the BBN-CMB crisis ? : The Institute of Physical and Chemical Research
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概要
- 論文の詳細を見る
Both Big Bang Nucleosynthesis (BBN) and Cosmic Microwave Background (CMB) are the sensitive probes to the cosmological models and can bound the parameters of the universe and the cosmological models. Improved precision in the measurements of the temperature fluctuation spectrum of CMB by the Wilkinson Microwave Anisotropy Probe (WMAP) enabled us to render considerably tight bounds on the cosmological parameters. Although the WMAP results are essentially consistent with the BBN predictions, the baryon/photon ratio inferred from CMB gives the helium-4 abundance slightly higher than the primordial helium-4 abundance deduced from the observations of HII regions. Dark radiation term included in the Randall-Sundrum type-II brane model, on the other hand, can be negative and decrease the cosmic expansion rate. We show that a parameter space consistent with the helium-4 abundance do exist in the RS-II brane model.
- 埼玉学園大学の論文