Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological implications from two decades of spectroscopic surveys at the Apache Point Observatory
Shadab Alam
,
Marie Aubert
(1)
,
Santiago Avila
,
Christophe Balland
(2)
,
Julian E. Bautista
,
Matthew A. Bershady
,
Dmitry Bizyaev
,
Michael R. Blanton
,
Adam S. Bolton
,
Jo Bovy
,
Jonathan Brinkmann
,
Joel R. Brownstein
,
Etienne Burtin
(3)
,
Solène Chabanier
(3)
,
Michael J. Chapman
,
Peter Doohyun Choi
,
Chia-Hsun Chuang
,
Johan Comparat
,
Andrei Cuceu
,
Kyle S. Dawson
,
Axel de la Macorra
,
Sylvain de la Torre
(4)
,
Arnaud de Mattia
(3)
,
Victoria de Sainte Agathe
(2)
,
Hélion Du Mas Des Bourboux
,
Stephanie Escoffier
(1)
,
Thomas Etourneau
(3)
,
James Farr
,
Andreu Font-Ribera
,
Peter M. Frinchaboy
,
Sebastien Fromenteau
,
Héctor Gil-Marín
,
Alma X. Gonzalez-Morales
,
Violeta Gonzalez-Perez
,
Kathleen Grabowski
,
Julien Guy
,
Adam J. Hawken
(1)
,
Jiamin Hou
,
Hui Kong
,
Mark Klaene
,
Jean-Paul Kneib
,
Jean-Marc Le Goff
(3)
,
Sicheng Lin
,
Daniel Long
,
Brad W. Lyke
,
Marie-Claude Cousinou
(1)
,
Paul Martini
,
Karen Masters
,
Faizan G. Mohammad
,
Jeongin Moon
,
Eva-Maria Mueller
,
Andrea Muñoz-Gutiérrez
,
Adam D. Myers
,
Seshadri Nadathur
,
Richard Neveux
(3)
,
Jeffrey A. Newman
,
Pasquier Noterdaeme
(5)
,
Audrey Oravetz
,
Daniel Oravetz
,
Nathalie Palanque-Delabrouille
(3)
,
Kaike Pan
,
James Parker
,
Romain Paviot
(4)
,
Will J. Percival
,
Ignasi Pérez-Ràfols
(2)
,
Patrick Petitjean
(5)
,
Matthew M. Pieri
(4)
,
Abhishek Prakash
,
Anand Raichoor
,
Corentin Ravoux
(3)
,
Mehdi Rezaie
,
James Rich
(3)
,
Ashley J. Ross
,
Graziano Rossi
,
Rossana Ruggeri
,
Vanina Ruhlmann-Kleider
(3)
,
Ariel G. Sánchez
,
F. Javier Sánchez
,
José R. Sánchez-Gallego
,
Conor Sayres
,
Donald P. Schneider
,
Hee-Jong Seo
,
Arman Shafieloo
,
Anže Slosar
,
Alex Smith
(3)
,
Julianna Stermer
(2)
,
Amelie Tamone
,
Jeremy L. Tinker
,
Rita Tojeiro
,
Mariana Vargas-Magaña
,
Andrei Variu
,
Yuting Wang
,
Benjamin A. Weaver
,
Anne-Marie Weijmans
,
Christophe Yèche
(3)
,
Pauline Zarrouk
(3)
,
Cheng Zhao
,
Gong-Bo Zhao
,
Zheng Zheng
Shadab Alam
- Function : Author
Santiago Avila
- Function : Author
Julian E. Bautista
- Function : Author
Matthew A. Bershady
- Function : Author
Dmitry Bizyaev
- Function : Author
- PersonId : 765523
- ORCID : 0000-0002-3601-133X
Michael R. Blanton
- Function : Author
Adam S. Bolton
- Function : Author
Jo Bovy
- Function : Author
Jonathan Brinkmann
- Function : Author
Joel R. Brownstein
- Function : Author
Michael J. Chapman
- Function : Author
Peter Doohyun Choi
- Function : Author
Chia-Hsun Chuang
- Function : Author
Johan Comparat
- Function : Author
Andrei Cuceu
- Function : Author
Kyle S. Dawson
- Function : Author
Axel de la Macorra
- Function : Author
Hélion Du Mas Des Bourboux
- Function : Author
Stephanie Escoffier
- Function : Author
- PersonId : 179794
- IdHAL : stephanie-escoffier
- ORCID : 0000-0002-2847-7498
- IdRef : 068869215
James Farr
- Function : Author
Andreu Font-Ribera
- Function : Author
Peter M. Frinchaboy
- Function : Author
Sebastien Fromenteau
- Function : Author
Héctor Gil-Marín
- Function : Author
Alma X. Gonzalez-Morales
- Function : Author
Violeta Gonzalez-Perez
- Function : Author
Kathleen Grabowski
- Function : Author
Julien Guy
- Function : Author
Jiamin Hou
- Function : Author
Hui Kong
- Function : Author
Mark Klaene
- Function : Author
Jean-Paul Kneib
- Function : Author
- PersonId : 755990
- ORCID : 0000-0002-4616-4989
- IdRef : 069878765
Sicheng Lin
- Function : Author
Daniel Long
- Function : Author
Brad W. Lyke
- Function : Author
Paul Martini
- Function : Author
Karen Masters
- Function : Author
Faizan G. Mohammad
- Function : Author
Jeongin Moon
- Function : Author
Eva-Maria Mueller
- Function : Author
Andrea Muñoz-Gutiérrez
- Function : Author
Adam D. Myers
- Function : Author
Seshadri Nadathur
- Function : Author
Jeffrey A. Newman
- Function : Author
Audrey Oravetz
- Function : Author
Daniel Oravetz
- Function : Author
Kaike Pan
- Function : Author
- PersonId : 765528
- ORCID : 0000-0002-2835-2556
James Parker
- Function : Author
Will J. Percival
- Function : Author
Abhishek Prakash
- Function : Author
Anand Raichoor
- Function : Author
Corentin Ravoux
- Function : Author
- PersonId : 1171883
- IdHAL : corentin-ravoux
- ORCID : 0000-0002-3500-6635
Mehdi Rezaie
- Function : Author
Ashley J. Ross
- Function : Author
Graziano Rossi
- Function : Author
Rossana Ruggeri
- Function : Author
Ariel G. Sánchez
- Function : Author
F. Javier Sánchez
- Function : Author
José R. Sánchez-Gallego
- Function : Author
Conor Sayres
- Function : Author
Donald P. Schneider
- Function : Author
Hee-Jong Seo
- Function : Author
Arman Shafieloo
- Function : Author
Anže Slosar
- Function : Author
Amelie Tamone
- Function : Author
Jeremy L. Tinker
- Function : Author
Rita Tojeiro
- Function : Author
Mariana Vargas-Magaña
- Function : Author
Andrei Variu
- Function : Author
Yuting Wang
- Function : Author
Benjamin A. Weaver
- Function : Author
Anne-Marie Weijmans
- Function : Author
Cheng Zhao
- Function : Author
Gong-Bo Zhao
- Function : Author
Zheng Zheng
- Function : Author
- PersonId : 766892
- ORCID : 0000-0003-1887-6732
Abstract
We present the cosmological implications from final measurements of clustering using galaxies, quasars, and Lyα forests from the completed Sloan Digital Sky Survey (SDSS) lineage of experiments in large-scale structure. These experiments, composed of data from SDSS, SDSS-II, BOSS, and eBOSS, offer independent measurements of baryon acoustic oscillation (BAO) measurements of angular-diameter distances and Hubble distances relative to the sound horizon, rd, from eight different samples and six measurements of the growth rate parameter, fσ8, from redshift-space distortions (RSD). This composite sample is the most constraining of its kind and allows us to perform a comprehensive assessment of the cosmological model after two decades of dedicated spectroscopic observation. We show that the BAO data alone are able to rule out dark-energy-free models at more than eight standard deviations in an extension to the flat, ΛCDM model that allows for curvature. When combined with Planck Cosmic Microwave Background (CMB) measurements of temperature and polarization, under the same model, the BAO data provide nearly an order of magnitude improvement on curvature constraints relative to primary CMB constraints alone. Independent of distance measurements, the SDSS RSD data complement weak lensing measurements from the Dark Energy Survey (DES) in demonstrating a preference for a flat ΛCDM cosmological model when combined with Planck measurements. The combined BAO and RSD measurements indicate σ8=0.85±0.03, implying a growth rate that is consistent with predictions from Planck temperature and polarization data and with General Relativity. When combining the results of SDSS BAO and RSD, Planck, Pantheon Type Ia supernovae (SNe Ia), and DES weak lensing and clustering measurements, all multiple-parameter extensions remain consistent with a ΛCDM model. Regardless of cosmological model, the precision on each of the three parameters, ΩΛ, H0, and σ8, remains at roughly 1%, showing changes of less than 0.6% in the central values between models. In a model that allows for free curvature and a time-evolving equation of state for dark energy, the combined samples produce a constraint Ωk=-0.0022±0.0022. The dark energy constraints lead to w0=-0.909±0.081 and wa=-0.49-0.30+0.35, corresponding to an equation of state of wp=-1.018±0.032 at a pivot redshift zp=0.29 and a Dark Energy Task Force Figure of Merit of 94. The inverse distance ladder measurement under this model yields H0=68.18±0.79 km s-1 Mpc-1, remaining in tension with several direct determination methods; the BAO data allow Hubble constant estimates that are robust against the assumption of the cosmological model. In addition, the BAO data allow estimates of H0 that are independent of the CMB data, with similar central values and precision under a ΛCDM model. Our most constraining combination of data gives the upper limit on the sum of neutrino masses at ∑mν<0.115 eV (95% confidence). Finally, we consider the improvements in cosmology constraints over the last decade by comparing our results to a sample representative of the period 2000–2010. We compute the relative gain across the five dimensions spanned by w, Ωk, ∑mν, H0, and σ8 and find that the SDSS BAO and RSD data reduce the total posterior volume by a factor of 40 relative to the previous generation. Adding again the Planck, DES, and Pantheon SN Ia samples leads to an overall contraction in the five-dimensional posterior volume of 3 orders of magnitude.