Is the expansion of the universe accelerating? All signs point to yes
David Rubin, Brian Hayden

TL;DR
This paper confirms the universe's accelerating expansion with high statistical significance, addressing previous doubts and strengthening the evidence through improved supernova analysis and combined cosmological constraints.
Contribution
It demonstrates errors in prior marginal evidence claims and provides a more robust measurement of acceleration using an improved supernova analysis and combined data.
Findings
4.2σ evidence for acceleration from SNe Ia alone
11.2σ evidence in a flat universe
Improved supernova analysis increases confidence in acceleration
Abstract
The accelerating expansion of the universe is one of the most profound discoveries in modern cosmology, pointing to a universe in which 70% of the mass-energy density has an unknown form spread uniformly across the universe. This result has been well established using a combination of cosmological probes (e.g., Planck Collaboration et al. 2016), resulting in a "standard model" of modern cosmology that is a combination of a cosmological constant with cold dark matter and baryons. The first compelling evidence for the acceleration came in the late 1990's, when two independent teams studying type Ia supernovae discovered that distant SNe Ia were dimmer than expected. The combined analysis of modern cosmology experiments, including SNe Ia, the Hubble constant, baryon acoustic oscillations, and the cosmic microwave background has now measured the contributions of matter and the cosmological…
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