Does the Hubble constant tension call for new physics?

被引：196

作者：

Mortsell, Edvard ^{[1
]}

Dhawan, Suhail ^{[1
]}

机构：

[1] Stockholm Univ, Dept Phys, Oskar Klein Ctr, SE-10691 Stockholm, Sweden

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2018年 / 09期

关键词：

dark energy experiments; dark energy theory; cosmological parameters from CMBR; supernova type Ia - standard candles; DISTANCE; GALAXY; COSMOLOGY; EFFICIENT; LAMBDA;

D O I：

10.1088/1475-7516/2018/09/025

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Lambda Cold Dark Matter model (Lambda CDM) represents the current standard model in cosmology. Within this, there is a tension between the value of the Hubble constant, H-0, inferred from local distance indicators and the angular scale of fluctuations in the Cosmic Microwave Background (CMB). In terms of Bayseian evidence, we investigate whether the tension is significant enough to warrant new physics in the form of modifying or adding energy components to the standard cosmological model. We find that late time dark energy explanations are not favoured by data whereas a pre-CMB decoupling extra dark energy component has a positive, although not substantial, Bayesian evidence. A constant equation of state of the additional early energy density is constrained to 0.086(-0.03)(+0:04). Although this value deviates significantly from 1/3, valid for dark radiation, the latter is favoured based on the Bayesian evidence. If the tension persists, future estimates of H-0 at the 1% level will be able to decisively determine which of the proposed explanations is favoured.

引用

页数：25

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