New cosmological constraints with extended-Baryon Oscillation Spectroscopic Survey DR14 quasar sample
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 $$z=1.52$$ z = 1.52 , and we conclude that the six-parameter $$\Lambda $$ Λ C...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2017-11-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-017-5344-1 |
| _version_ | 1828770765875445760 |
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| author | Lu Chen Qing-Guo Huang Ke Wang |
| author_facet | Lu Chen Qing-Guo Huang Ke Wang |
| author_sort | Lu Chen |
| collection | DOAJ |
| description | 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 $$z=1.52$$ z = 1.52 , and we conclude that the six-parameter $$\Lambda $$ Λ CDM model is preferred. Exploring some extensions to the $$\Lambda $$ Λ CDM model, we find that the equation of state of dark energy reads $$w=-1.036\pm 0.056$$ w = - 1.036 ± 0.056 in the wCDM model, the effective number of relativistic degrees of freedom in the Universe is $$N_\text {eff}=3.09_{-0.20}^{+0.18}$$ N eff = 3 . 09 - 0.20 + 0.18 in the $$N_\text {eff}+\Lambda $$ N eff + Λ CDM model and the spatial curvature parameter is $$\Omega _k=(1.8\pm 1.9)\times 10^{-3}$$ Ω k = ( 1.8 ± 1.9 ) × 10 - 3 in the $$\Omega _k+\Lambda $$ Ω k + Λ CDM model at $$68\%$$ 68 % confidence level (C.L.), and the $$95\%$$ 95 % C.L. upper bounds on the sum of three active neutrinos masses are $$\sum m_\nu <0.16$$ ∑ m ν < 0.16 eV for the normal hierarchy (NH) and $$\sum m_\nu <0.19$$ ∑ m ν < 0.19 eV for the inverted hierarchy (IH) with $$\Delta \chi ^2\equiv \chi ^2_\text {NH}-\chi ^2_\text {IH}=-1.25$$ Δ χ 2 ≡ χ NH 2 - χ IH 2 = - 1.25 . |
| first_indexed | 2024-12-11T14:13:02Z |
| format | Article |
| id | doaj.art-ced743e9f2ef4d6da1c94a7e846d168f |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-11T14:13:02Z |
| publishDate | 2017-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-ced743e9f2ef4d6da1c94a7e846d168f2022-12-22T01:03:20ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522017-11-0177111710.1140/epjc/s10052-017-5344-1New cosmological constraints with extended-Baryon Oscillation Spectroscopic Survey DR14 quasar sampleLu Chen0Qing-Guo Huang1Ke Wang2CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of SciencesCAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of SciencesCAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of SciencesAbstract 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 $$z=1.52$$ z = 1.52 , and we conclude that the six-parameter $$\Lambda $$ Λ CDM model is preferred. Exploring some extensions to the $$\Lambda $$ Λ CDM model, we find that the equation of state of dark energy reads $$w=-1.036\pm 0.056$$ w = - 1.036 ± 0.056 in the wCDM model, the effective number of relativistic degrees of freedom in the Universe is $$N_\text {eff}=3.09_{-0.20}^{+0.18}$$ N eff = 3 . 09 - 0.20 + 0.18 in the $$N_\text {eff}+\Lambda $$ N eff + Λ CDM model and the spatial curvature parameter is $$\Omega _k=(1.8\pm 1.9)\times 10^{-3}$$ Ω k = ( 1.8 ± 1.9 ) × 10 - 3 in the $$\Omega _k+\Lambda $$ Ω k + Λ CDM model at $$68\%$$ 68 % confidence level (C.L.), and the $$95\%$$ 95 % C.L. upper bounds on the sum of three active neutrinos masses are $$\sum m_\nu <0.16$$ ∑ m ν < 0.16 eV for the normal hierarchy (NH) and $$\sum m_\nu <0.19$$ ∑ m ν < 0.19 eV for the inverted hierarchy (IH) with $$\Delta \chi ^2\equiv \chi ^2_\text {NH}-\chi ^2_\text {IH}=-1.25$$ Δ χ 2 ≡ χ NH 2 - χ IH 2 = - 1.25 .http://link.springer.com/article/10.1140/epjc/s10052-017-5344-1 |
| spellingShingle | Lu Chen Qing-Guo Huang Ke Wang New cosmological constraints with extended-Baryon Oscillation Spectroscopic Survey DR14 quasar sample European Physical Journal C: Particles and Fields |
| title | New cosmological constraints with extended-Baryon Oscillation Spectroscopic Survey DR14 quasar sample |
| title_full | New cosmological constraints with extended-Baryon Oscillation Spectroscopic Survey DR14 quasar sample |
| title_fullStr | New cosmological constraints with extended-Baryon Oscillation Spectroscopic Survey DR14 quasar sample |
| title_full_unstemmed | New cosmological constraints with extended-Baryon Oscillation Spectroscopic Survey DR14 quasar sample |
| title_short | New cosmological constraints with extended-Baryon Oscillation Spectroscopic Survey DR14 quasar sample |
| title_sort | new cosmological constraints with extended baryon oscillation spectroscopic survey dr14 quasar sample |
| url | http://link.springer.com/article/10.1140/epjc/s10052-017-5344-1 |
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