Testing low-redshift cosmic acceleration with large-scale structure

Seshadri Nadathur, Will J. Percival, Florian Beutler, Hans Winther

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Abstract

We examine the cosmological implications of measurements of the void-galaxy cross-correlation at redshift z = 0.57 combined with baryon acoustic oscillation (BAO) data at 0.1 < z < 2.4. We find direct evidence of the late-time acceleration due to dark energy at > 10σ significance from these data alone, independent of the cosmic microwave background and supernovae. Using a nucleosynthesis prior on Ωbh 2, we measure the Hubble constant to be H0 = 72.3±1.9 km s−1Mpc−1 from BAO+voids at z < 2, and H0 = 69.0 ± 1.2 km s−1Mpc−1 when adding Lyman-α BAO at z = 2.34, both independent of the CMB. Adding voids to CMB, BAO and supernova data greatly improves measurement of the dark energy equation of state, increasing the figure of merit by > 40%, but remaining consistent with flat Λ cold dark matter.
Original languageEnglish
Article number221301
Number of pages6
JournalPhysical Review Letters
Volume124
Issue number22
Early online date2 Jun 2020
DOIs
Publication statusPublished - 5 Jun 2020

Keywords

  • astro-ph.CO
  • RCUK
  • STFC
  • ST/N00180X/1

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