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Testing Low-Redshift Cosmic Acceleration with Large-Scale Structure.

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This study provides strong evidence for dark energy driving cosmic acceleration using galaxy void data and baryon acoustic oscillations. The findings independently measure the Hubble constant and refine dark energy properties.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Particle Physics

Background:

  • The universe's expansion is accelerating, driven by dark energy.
  • Baryon acoustic oscillations (BAO) provide a standard ruler to measure cosmic distances.
  • Galaxy void-galaxy correlations offer an independent probe of large-scale structure and cosmic acceleration.

Purpose of the Study:

  • To investigate the cosmological implications of void-galaxy cross-correlation measurements.
  • To independently confirm late-time cosmic acceleration attributed to dark energy.
  • To measure the Hubble constant and constrain the dark energy equation of state.

Main Methods:

  • Analyzing void-galaxy cross-correlation data at redshift z=0.57.
  • Combining void data with baryon acoustic oscillation (BAO) measurements across a range of redshifts (0.1
  • Utilizing a nucleosynthesis prior on Ωbh² for Hubble constant calculations.

Main Results:

  • Direct evidence for late-time cosmic acceleration from dark energy at >10σ significance, independent of CMB and supernovae data.
  • Hubble constant measurements: H₀=72.3±1.9 km s⁻¹ Mpc⁻¹ (BAO+voids, z<2) and H₀=69.0±1.2 km s⁻¹ Mpc⁻¹ (adding Lyman-α BAO, z=2.34), both independent of CMB.
  • Improved measurement of the dark energy equation of state by >40% when adding void data to existing cosmological datasets.

Conclusions:

  • Void-galaxy correlations provide robust, independent evidence for dark energy and cosmic acceleration.
  • The measurements are consistent with the standard flat ΛCDM model.
  • This research enhances our understanding of dark energy's role in the universe's evolution.