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DESI, an Ambitious Probe of Dark Energy, Achieves its Next Major Milestone

Paul Preuss DESI-Mayall-sky feature

The U.S. Department of Energy has announced approval of Critical Decision 2 (CD–2), authorizing the scientific scope, schedule, and funding profile of DESI, the Dark Energy Spectroscopic Instrument, an exceptional apparatus designed to improve our understanding of the role of dark energy in the expansion history of the universe.

Supernova Hunting with Supercomputers

Simulation of the expanding debris from a supernova explosion (shown in red) running over and shredding a nearby star (shown in blue).
Image credit: Daniel Kasen, Berkeley Lab/ UC Berkeley

Berkeley researchers provide “roadmap” and tools for finding and studying Type Ia supernovae in their natural habitat

Confirmed: Stellar Behemoth Self-Destructs in a Type IIb Supernova

The Palomar 48 inch telescope. (Photo by: Iair Arcavi, Weizmann Instiute of Science)

Wolf-Rayet stars, more than 20 times as massive as the Sun and at least five times as hot, are relatively rare and often obscured. Scientists don’t know much about how they form, live and die.

BOSS Quasars Track the Expanding Universe – the Most Precise Measurement Yet

The Baryon Oscillation Spectroscopic Survey (BOSS) pioneered the use of quasars to chart the universe’s expansion and investigate the properties of dark energy through studies of large-scale structure. New techniques of analysis led by Berkeley Lab scientists, combined with other new BOSS quasar measures of the young universe’s structure, have produced the most precise measurement of expansion since galaxies formed.

Setting a Trap for Gravity Waves

In 1996 Uros Seljak was a postdoc at Harvard, contemplating ways to extract information from the cosmic microwave background (CMB). The distribution of anisotropies, slight temperature differences, in the CMB had much to say about the large-scale structure of the universe. If it were also possible to detect the polarization of the CMB itself, however,

BOSS Measures the Universe to One-Percent Accuracy

The Baryon Oscillation Spectroscopic Survey (BOSS), the largest component of the third Sloan Digital Sky Survey, has measured the clustering of nearly 1.3 million galaxies spectroscopically to determine the “standard ruler” of the universe’s large-scale structure to within one percent. This is the most precise such measurement ever made and is likely to establish the standard for years to come.

Searching for Cosmic Accelerators Via IceCube

New results from IceCube, the neutrino observatory buried at the South Pole, may show the way to locating and identifying cosmic accelerators in our galaxy that are 40 million times more powerful than the Large Hadron Collider at CERN.

First Hundred Thousand Years of Our Universe

Berkeley Lab researchers take the furthest look back through time yet – 100 years to 300,000 years after the Big Bang – and find tantalizing new hints of clues as to what might have happened.

Unusual Supernova is Doubly Unusual for Being Perfectly Normal

Type Ia supernovae are indispensable milestones for measuring the expansion of the universe. With definitive measures of Supernova 2011fe, the same “Backyard Supernova” that thrilled amateur and professional astronomers alike in the summer of 2011, the Nearby Supernova Factory led by Lawrence Berkeley National Laboratory demonstrates that this unusually close-by Type Ia is such a perfect example of its kind that future Type Ia’s – and models meant to explain their physics – must be measured against it.

Building the Massive Simulation Sets Essential to Planck Results

The Planck collaboration has released its first cosmological results, based on trillions of measurements of the cosmic microwave background. The results owe much to Berkeley Lab’s National Energy Research Scientific Computing Center (NERSC), including tens of millions of hours of massively parallel processing, plus the expertise of physicists and computational scientists in the Computational Cosmology Center (C3) who generated a quarter of a million simulated maps of the Planck sky, essential to the analysis.