The Dark Energy Survey collaboration has created the largest ever maps of the distribution and shapes of galaxies, tracing both ordinary and dark matter in the universe out to a distance of over 7 billion light years. The analysis, which includes the first three years of data from the survey, is consistent with predictions from the current best model of the universe, the standard cosmological model. Nevertheless, there remain hints from DES and other experiments that matter in the current universe is a few percent less clumpy than predicted.
From the University of Chicago, May 21, 2021: Long-time University of Chicago professor of astronomy and astrophysics, Richard Kron created the Sloan Digital Sky Survey which set the stage for the Dark Energy Survey. Although he is retiring this year after 40 years of mapping the universe, he plans on staying on as director of the Dark Energy Survey.
DESI will capture and study the light from tens of millions of galaxies and other distant objects to better understand our universe and the properties of dark energy. The formal start of DESI’s five-year survey follows a four-month trial run of its custom instrumentation that captured 4-million spectra of galaxies — more than the combined output of all previous spectroscopic surveys. Fermilab has contributed multiple components to the international collaboration led by Berkeley Lab.
From Marianne TV (France), April 21, 2021: An interview on the Muon g-2 experiment result with Laurent Lellouch, CNRS research director at the Theoretical Physics Center and the Universe Physics Institute.
From Jumbo News, March 31, 2021: Fermilab’s Josh Frieman, Tom Diehl, Antonella Palmese, and Rich Kron as part of the Dark Energy Survey collaboration, have completed scanning a quarter of the southern skies for six years and cataloguing hundreds of millions of distant galaxies.
From IG Último Segundo (Brazil), March 7, 2021: Fermilab researcher Marcelle Soares-Santos was included in this International Women’s Day story for her studies on dark matter and dark energy.
From Forbes, Feb. 22, 2021: Fermilab scientist Don Lincoln explains how modern cosmology imagines our universe is an astronomical confection with three primary ingredients: ordinary matter, dark matter and dark energy.
From UChicago News, Feb. 12, 2021: Fermilab scientist Yuanyuan Zhang discusses the implications of the studies she led on intracluster light using Dark Energy Survey data, which may include a new way of measuring dark matter.
From Universe Today, Feb. 3, 2021: Recent published results from the Dark Energy Survey point to intracluster light — feeble light from rogue stars that don’t belong to a galaxy — as a potential pathway to measure dark matter. Fermilab scientist Yuanyuan Zhang contextualizes the findings.
From Super Interessante, Jan. 31, 2021: A team of researchers from Fermilab and the National Observatory in Brazil used the light of solitary stars to calculate the mass of some of the largest structures in the cosmos — galaxy clusters. In addition to taking the most detailed measurement ever published of intracluster light, the team’s new method of measurement can help further investigate dark matter.