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

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 $\Lambda$CDM 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 ${\Omega }_{\mathrm{m}}=0.356\pm 0.024$ for a base $\Lambda$CDM cosmology, ${\Omega }_{\mathrm{m}}=0.391_{-0.021}^{+0.028},w=-1.50_{-0.28}^{+0.43}$ additionally allowing the dark energy equation of state $w$ to vary, and ${\Omega }_{\mathrm{m}}=0.331_{-0.094}^{+0.067},w=-1.41_{-0.31}^{+0.70},\mathrm{and}{\Omega }_{\mathrm{k}}=0.06_{-0.13}^{+0.18}$ 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 ${\Omega }_{\mathrm{m}}$ over CMB+SN for $\Lambda$CDM, a 5% improvement in parameter ${\Omega }_{\mathrm{m}}$ when $w$ is allowed to vary, and a 32% and 68% improvement in parameters ${\Omega }_{\mathrm{m}}$ and ${\Omega }_{\mathrm{k}}$ when allowing for spatial curvature.

arXiv comment11 pages, 9 figures. Accepted by MNRAS

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