New estimates for dark energy equation of state and Hubble constant – University of Copenhagen

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07 November 2018

New estimates for dark energy equation of state and Hubble constant

Cosmology:

New independent measurements for dark energy equation state and Hubble parameter have been derived. Latest estimates by the Dark Energy Survey (DES) collaboration were submitted to the electronic preprint service arXiv on 7th of November.

New independent measurements for dark energy equation state and Hubble parameter have been derived. Latest estimates by the Dark Energy Survey (DES) collaboration were submitted to the electronic preprint service arXiv on 7th of November.

DECam Focal Plane Detector (Reidar Hahn, Fermilab)

Dark Energy Survey (DES) collaboration has measured matter density of  Ω_m = 0.331±0.038 for a flat ΛCDM universe. Combining constrains from their Type Ia supernovae measurements with ones from cosmic microwave background (CMB), DES collaboration reports w = −0.978 ± 0.059 for dark energy equation of state and Ω_m = 0.321±0.018 for matter density assuming flat wCDM model. Based on Type Ia supernovae, and baryon acoustic oscillation measurements, collaboration reports H67.77±1.30km/s/Mpc for Hubble constant. The newly reported value for Hubble constant is consistent with estimate derived from Planck measurement.

DARK's affiliate scientist, Professor Tamara Davis from (University of Queensland) is heavily involved in DES. Another former DARKer Dr. Per Andersen is involved in the collaboration as well.

Links to the articles: