New cosmological constraints with extended-Baryon Oscillation Spectroscopic Survey DR14 quasar sample

Lu Chen; Qing-Guo Huang; Ke Wang

doi:10.1140/epjc/s10052-017-5344-1

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2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2017) 77: 762
https://doi.org/10.1140/epjc/s10052-017-5344-1

Regular Article - Theoretical Physics

New cosmological constraints with extended-Baryon Oscillation Spectroscopic Survey DR14 quasar sample

Lu Chen¹^,2^*, Qing-Guo Huang¹^,2^,3 and Ke Wang¹^,2

¹ CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, China
² School of Physical Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing, 100049, China
³ Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha, 410081, China

^* e-mail: chenlu@itp.ac.cn

Received: 16 July 2017
Accepted: 1 November 2017
Published online: 13 November 2017

Abstract

We update the constraints on the cosmological parameters by adopting the Planck data released in 2015 and baryon acoustic oscillation (BAO) measurements including the new DR14 quasar sample measurement at redshift $$z=1.52$$ , and we conclude that the six-parameter $\Lambda$ CDM model is preferred. Exploring some extensions to the $\Lambda$ CDM model, we find that the equation of state of dark energy reads $w=-1.036\pm 0.056$ in the wCDM model, the effective number of relativistic degrees of freedom in the Universe is $N_\text {eff}=3.09_{-0.20}^{+0.18}$ in the $N_\text {eff}+\Lambda$ CDM model and the spatial curvature parameter is $\Omega _k=(1.8\pm 1.9)\times 10^{-3}$ in the $\Omega _k+\Lambda$ CDM model at $68\%$ confidence level (C.L.), and the $95\%$ C.L. upper bounds on the sum of three active neutrinos masses are $\sum m_\nu <0.16$ eV for the normal hierarchy (NH) and $\sum m_\nu <0.19$ eV for the inverted hierarchy (IH) with $\Delta \chi ^2\equiv \chi ^2_\text {NH}-\chi ^2_\text {IH}=-1.25$ .