Dynamical dark energy in light of the latest observations
By Gong-Bo Zhao, M. Raveri, Levon Pogosian, Yuting Wang, Robert G. Crittenden, Will Handley, Will J. Percival, F. Beutler, J. Brinkmann, C. Chuang and 16 more. Nature Astronomy, 2017
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A flat Friedmann–Robertson–Walker universe dominated by a cosmological constant (Λ) and cold dark matter (CDM) has been the working model preferred by cosmologists since the discovery of cosmic acceleration1,2. However, tensions of various degrees of significance are known to be present among existing datasets within the ΛCDM framework3–11. In particular, the Lyman-α forest measurement of the baryon acoustic oscillations (BAO) by the Baryon Oscillation Spectroscopic Survey3 prefers a smaller value of the matter density fraction ΩM than that preferred by cosmic microwave background (CMB). Also, the recently measured value of the Hubble constant, H0 = 73.24 ± 1.74 km s−1 Mpc−1 (ref. 12), is 3.4σ higher than the 66.93 ± 0.62 km s−1 Mpc−1 inferred from the Planck CMB data7. In this work, we investigate whether these tensions can be interpreted as evidence for a non-constant dynamical dark energy. Using the Kullback–Leibler divergence13 to quantify the tension between datasets, we find that the tensions are relieved by an evolving dark energy, with the dynamical dark energy model preferred at a 3.5σ significance level based on the improvement in the fit alone. While, at present, the Bayesian evidence for the dynamical dark energy is insufficient to favour it over ΛCDM, we show that, if the current best-fit dark energy happened to be the true model, it would be decisively detected by the upcoming Dark Energy Spectroscopic Instrument survey14.Recent observations reveal tension between various cosmological probes. Assuming dark energy to be non-constant, depending on redshift, may relieve this tension. The Dark Energy Spectroscopic Instrument survey will be able to confirm this result.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/eb6c20db43dc6c1f7f28a82ba8946d470c15b989
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In Astronomy and Astrophysics
Citations in the corpus
- Interacting dark energy in the early 2020s: A promising solution to the H0 and cosmic shear tensions (2019, unknown): “[10–109].”
- New physics in light of the H0 tension: An alternative view (2019, background): “[60–209] for what is inevitably an incomplete list of works examining these possibilities.”
- Interacting dark energy with time varying equation of state and the H0 tension (2018, background): “The equation of state parameter of dark energy is assumed to evolve with time, because this seems the preferred scenario in several analysis [42, 43, 44, 45, 46].”