le 22 Jul, 2020
Comparison of the growth rate of structure measurements from the cosmic voids analysis with other estimates from SDSS BOSS DR12 and eBOSS DR16 data using voids (circles) and conventional clustering techniques (squares).
The Sloan Digital Sky Survey (SDSS) has just published a comprehensive analysis of the largest three-dimensional map of the Universe ever created, filling in the most significant gaps in our possible exploration of its history.
The new results come from the extended Baryon Oscillation Spectroscopic Survey (eBOSS), an international collaboration of more than 100 astrophysicists that is one of the SDSS’s component surveys. On Monday 20 July, building on 20 years of observations, the eBOSS collaboration published a comprehensive analysis of the largest three-dimensional map of the Universe ever created. This map allows the history of the expansion of the Universe to be reconstructed over a period of 11 billion years, providing unprecedented leverage to accurately quantify the acceleration of this expansion over the past 6 billion years. This acceleration is sometimes attributed to mysterious dark energy.
Furthermore, comparison with the measurement of expansion in the early ages of the Universe using Planck satellite measurements reveals a disagreement of about 10% on the estimate of the Hubble constant. This result raises high hopes in the coming years for a new physics at cosmological scales.
At the heart of the new results, presented in more than 20 papers, are detailed measurements of more than two million galaxies and quasars, as well as thousands of cosmic voids, giving rise to a more accurate map of the Universe. These new results come from an international collaboration involving teams from CEA, CNRS and AMU. This work was supported by the French National Research Agency (ANR).
Contacts:
Marie Aubert (maubert _at_ cppm.in2p3.fr)
Marie-Claude Cousinou (cousinou _at_ cppm.in2p3.fr)
Stephanie Escoffier (escoffier _at_ cppm.in2p3.fr)