Dynamical dark energy in light of the latest observations
Dynamical dark energy in light of the latest observations
复制标题
DOI：
10.1038/s41550-017-0216-z
复制
发表时间：
2017-08
期刊：
影响因子：
14.1
通讯作者：
Gong-Bo Zhao;M. Raveri;L. Pogosian;Yuting Wang;R. Crittenden;W. Handley;W. Percival;F. Beutler-
中科院分区：
文献类型：
--
作者：
Gong-Bo Zhao;M. Raveri;L. Pogosian;Yuting Wang;R. Crittenden;W. Handley;W. Percival;F. Beutler-
A flat Friedmann–Robertson–Walker universe dominated by a cosmological constant (Λ) and cold dark matter (CDM) has been the working model preferred by cosmologists since the discovery of cosmic acceleration,. However, tensions of various degrees of significance are known to be present among existing datasets within theΛCDM framework, , , , , , , –. In particular, the Lyman-α forest measurement of the baryon acoustic oscillations (BAO) by the Baryon Oscillation Spectroscopic Survey prefers a smaller value of the matter density fractionΩMthan that preferred by cosmic microwave background (CMB). Also, the recently measured value of the Hubble constant,H0= 73.24 ± 1.74 km s−1Mpc−1(ref. ), is 3.4σhigher than the 66.93 ± 0.62 km s−1Mpc−1inferred from the Planck CMB data. In this work, we investigate whether these tensions can be interpreted as evidence for a non-constant dynamical dark energy. Using the Kullback–Leibler divergence to quantify the tension between datasets, we find that the tensions are relieved by an evolving dark energy, with the dynamical dark energy model preferred at a 3.5σsignificance level based on the improvement in the fit alone. While, at present, the Bayesian evidence for the dynamical dark energy is insufficient to favour it overΛCDM, we show that, if the current best-fit dark energy happened to be the true model, it would be decisively detected by the upcoming Dark Energy Spectroscopic Instrument survey.
