Cosmological measurements from void-galaxy and galaxy-galaxy clustering in the Sloan Digital Sky Survey

Alex Woodfinden, Will J. Percival, Seshadri Nadathur, Hans A. Winther, T. S. Fraser, Elena Massara, Enrique Paillas, Slađana Radinović

Research output: Contribution to journalArticlepeer-review

31 Downloads (Pure)

Abstract

We present the cosmological implications of measurements of void-galaxy and galaxy-galaxy clustering from the Sloan Digital Sky Survey (SDSS)  Main Galaxy Sample (MGS), Baryon Oscillation Spectroscopic Survey (BOSS), and extended BOSS (eBOSS) luminous red galaxy catalogues from SDSS Data Release 7, 12, and 16, covering the redshift range 0.07 < z < 1.0. We fit a standard ΛCDM cosmological model as well as various extensions including a constant dark energy equation of state not equal to -1, a time-varying dark energy equation of state, and these same models allowing for spatial curvature. Results on key parameters of these models are reported for void-galaxy and galaxy-galaxy clustering alone, both of these combined, and all these combined with measurements from the cosmic microwave background (CMB) and supernovae (SN). For the combination of void-galaxy and galaxy-galaxy clustering, we find tight constraints of Ωm=0.356±0.024 for a base ΛCDM cosmology, Ωm=0.391+0.028-0.021, w=-1.50+0.43-0.28 additionally allowing the dark energy equation of state w to vary, and Ωm=0.331+0.067-0.094w=-1.41+0.70-0.31, and Ωk=0.06+0.18-0.13 further extending to non-flat models. The combined SDSS results from void-galaxy and galaxy-galaxy clustering in combination with CMB+SN provide a 30% improvement in parameter Ωm over CMB+SN for ΛCDM,  a 5% improvement in parameter Ωm when w is allowed to vary, and a 32% and 68% improvement in parameters Ωm and Ωk when allowing for spatial curvature.

We present the cosmological implications of measurements of void-galaxy and galaxy-galaxy clustering from the Sloan Digital
Sky Survey (SDSS) Main Galaxy Sample (MGS), Baryon Oscillation Spectroscopic Survey (BOSS), and extended BOSS
(eBOSS) luminous red galaxy catalogues from SDSS Data Release 7, 12, and 16, covering the redshift range 0.07 < 푧 < 1.0.
We fit a standard ΛCDM cosmological model as well as various extensions including a constant dark energy equation of
state not equal to −1, a time-varying dark energy equation of state, and these same models allowing for spatial curvature.
Results on key parameters of these models are reported for void-galaxy and galaxy-galaxy clustering alone, both of these
combined, and all these combined with measurements from the cosmic microwave background (CMB) and supernovae (SN).
For the combination of void-galaxy and galaxy-galaxy clustering, we find tight constraints of Ωm = 0.356 ± 0.024 for a base
ΛCDM cosmology, Ωm = 0.391+0.028
−0.021, 푤 = −1.50+0.43
+0.28 additionally allowing the dark energy equation of state 푤 to vary, and
Ωm = 0.331+0.067
−0.094, 푤 = −1.41+0.70
−0.31, and Ωk = 0.06+0.18
−0.13 further extending to non-flat models. The combined SDSS results from
void-galaxy and galaxy-galaxy clustering in combination with CMB+SN provide a 30% improvement in parameter Ωm over
CMB+SN for ΛCDM, a 5% improvement in parameter Ωm when 푤 is allowed to vary, and a 32% and 68% improvement in
parameters Ωm and Ωk when allowing for spatial curvature.
We present the cosmological implications of measurements of void-galaxy and galaxy-galaxy clustering from the Sloan Digital
Sky Survey (SDSS) Main Galaxy Sample (MGS), Baryon Oscillation Spectroscopic Survey (BOSS), and extended BOSS
(eBOSS) luminous red galaxy catalogues from SDSS Data Release 7, 12, and 16, covering the redshift range 0.07 < 푧 < 1.0.
We fit a standard ΛCDM cosmological model as well as various extensions including a constant dark energy equation of
state not equal to −1, a time-varying dark energy equation of state, and these same models allowing for spatial curvature.
Results on key parameters of these models are reported for void-galaxy and galaxy-galaxy clustering alone, both of these
combined, and all these combined with measurements from the cosmic microwave background (CMB) and supernovae (SN).
For the combination of void-galaxy and galaxy-galaxy clustering, we find tight constraints of Ωm = 0.356 ± 0.024 for a base
ΛCDM cosmology, Ωm = 0.391+0.028
−0.021, 푤 = −1.50+0.43
+0.28 additionally allowing the dark energy equation of state 푤 to vary, and
Ωm = 0.331+0.067
−0.094, 푤 = −1.41+0.70
−0.31, and Ωk = 0.06+0.18
−0.13 further extending to non-flat models. The combined SDSS results from
void-galaxy and galaxy-galaxy clustering in combination with CMB+SN provide a 30% improvement in parameter Ωm over
CMB+SN for ΛCDM, a 5% improvement in parameter Ωm when 푤 is allowed to vary, and a 32% and 68% improvement i
parameters Ωm and Ωk when allowing for spatial curvature.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Early online date8 Jun 2023
DOIs
Publication statusEarly online - 8 Jun 2023

Keywords

  • astro-ph.CO
  • cosmology: observations
  • cosmology: dark energy
  • cosmology: large-scale structure of Universe
  • cosmology: cosmological parameters
  • UKRI
  • STFC
  • ST/T005009/2

Cite this