The tension on the cosmological parameters from different observational data

Дата и время публикации : 2013-08-26T16:18:07Z

Авторы публикации и институты :
Qing Gao
Yungui Gong

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: use revtex, 2 tables and 3 figures, full planck data is used in this version
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO, gr-qc

Краткий обзор статьи: Planck measurements of the cosmic microwave background power spectra find a lower value of the Hubble constant $H_0$ and a higher value of the fractional matter energy density $Omega_{m0}$ for the concordance $Lambda$CDM model, and these results are in tension with those obtained from Type Ia supernovae. We studied the reason for the tension of different measurements by considering dynamical dark energy model. We found that the tension is eased for dark energy model with one dynamical parameter for the equation of state $w(z)$, and no tension exists for the Chevallier-Polarski-Linder model with two dynamical parameters. We suggest that the tension between different measurements may not come only from the systematics existed in the data, but comes from the restriction imposed on the dark energy itself. The dynamical dark energy model is in tension with the concordance $Lambda$CDM model due to the tension in the value of $H_0$.

Category: Physics