Interaction between dark energy and dark matter: observational constraints from H(z), BAO, CMB and SNe Ia

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

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15 pages, 2 figures

Scientific paper

In order to test if there is energy transfer between dark energy and dark matter, we investigate cosmological constraints on two forms of nontrivial interaction between the dark matter sector and the sector responsible for the acceleration of the universe, in light of the newly revised $H(z)$ data, the baryonic acoustic oscillation (BAO) peak detected by large-scale correlation function of luminous red galaxies from Sloan Digital Sky Survey (SDSS), the cosmic microwave background (CMB) observations and the most recent 557 Union2 SNe Ia data. For the $\gamma_m$IDE model in which the interaction term expresses as $Q=3\gamma_m H\rho_m$ with the corresponding constant $\gamma_m$ quantifying the extent of interaction, we obtain $\gamma_m=-0.013_{-0.011}^{+0.013}$, $\gamma_m=-0.009_{-0.012}^{+0.013}$ and $\gamma_m=-0.011_{-0.011}^{+0.012}$ with $H(z)$+BAO+CMB, SNe Ia+BAO+CMB and $H(z)$+SNe Ia+BAO+CMB, respectively. For the $\gamma_d$IDE model in which the interaction term takes the form $Q=3\gamma_d H\rho_X$ with the corresponding constant $\gamma_d$ quantifying the extent of interaction, the best-fit values are $\gamma_d=-0.040_{-0.042}^{+0.042}$, $\gamma_d=-0.023_{-0.040}^{+0.039}$ and $\gamma_d=-0.030_{-0.037}^{+0.037}$. These results indicate that, on the one hand, the concordance $\Lambda$CDM model without any interaction remains a good fit to the recent observational data; on the other hand, the interaction that the energy transferring from dark matter to dark energy is slightly favoured over the interaction delivering energy from dark energy to dark matter, which is in agreement with the results by using other observational data such as the 182 Gold SNe Ia and 397 Constitution SNe Ia samples in the previous works.

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