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Dark Energy Survey @TheDESurvey
Feb 15
RT @jason__rhodes:Congrats to @NASAJPL postdoc Dr. Agnes Ferte on being named Dark Energy Survey Scientist of the Week. I am one pr… https://t.co/WTpnE4Nbj1

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Dark Energy Survey @TheDESurvey
Feb 15
RT @SciNode:A #telescope in the Chilean #Andes helps scientists better understand #DarkEnergy - https://t.co/j89mSUwilq… https://t.co/398JwQP4sJ

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Dark Energy Survey @TheDESurvey
Feb 14
We have a new DES Scientist of the Week! She has studied cosmology in three different countries, and one of her ins… https://t.co/Dc0Qud9Hgs

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Dark Energy Survey @TheDESurvey
Feb 14
RT @SciNode:A machine-learning model can be trained to classify and label types of #galaxies - https://t.co/j89mSUwilq… https://t.co/GJsvMq1G8j

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Dark Energy Survey @TheDESurvey
Feb 13
RT @NCSAatIllinois:Here's a great read from @SciNode about the @theDESurvey and their amazing #BigData work, done in-part at NCSA: https://t.co/7nS7VJlOEF

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The Dark Energy Survey
3 days ago
We have a new DES Scientist of the Week! She has studied cosmology in three different countries, and one of her inspirations comes from a century ago.

www.darkenergysurvey.org/scientistoftheweek/agnes-ferte/ ... See MoreSee Less
Agnès Ferté - The Dark Energy Survey
www.darkenergysurvey.org
Agnès Ferté is a postdoc at NASA’s Jet Propulsion Laboratory (JPL). After growing up in the French countryside near Reims, ... Read more »
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The Dark Energy Survey
5 days ago
#DESimages (Galaxy disrupted by multiple neighbors, credit: Erin Sheldon) ... See MoreSee Less
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The Dark Energy Survey
1 week ago
We have a new DES Scientist of the Week! His work focuses on statistics to understand the Universe.

www.darkenergysurvey.org/scientistoftheweek/ben-moews/ ... See MoreSee Less
Ben Moews - The Dark Energy Survey
www.darkenergysurvey.org
Ben Moews is a PhD student and Principal’s Career Development Scholar at the University of Edinburgh’s Institute for Astronomy. He ... Read more »
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The Dark Energy Survey
2 weeks ago
#DESimages (credit: Erin Sheldon) ... See MoreSee Less
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The Dark Energy Survey
2 weeks ago
We have a new DES Scientist of the Week! Niall MacCrann works on weak gravitational lensing, and has a thoughtful choice for physics' biggest recent advance.

www.darkenergysurvey.org/scientistoftheweek/niall-maccrann/ ... See MoreSee Less
Niall MacCrann - The Dark Energy Survey
www.darkenergysurvey.org
Niall MacCrann is a postdoc at The Ohio State University. He works on many topics related to weak gravitational lensing, ... Read more »
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News

Scientists Leverage HPC and AI to Wrangle the ‘Galaxy Zoo’

July 8, 2019 12:00 pm

The research team developed a new approach to classifying these hundreds of millions of galaxies. Instead of relying on crowdsourced classification, the researchers used knowledge from the state-of-the-art Xception neural network, combined with the datasets generated by the Galaxy Zoo project, to train its deep learning models. They then applied the trained model to galactic images from the Dark Energy Survey (DES) – where it achieved a 99.6% accuracy in identifying spiral and elliptical galaxies.

Three sky surveys completed in preparation for Dark Energy Spectroscopic Instrument

July 8, 2019 12:00 pm

It took three sky surveys — conducted at telescopes in two continents, covering one-third of the visible sky, and requiring almost 1,000 observing nights – to prepare for a new project that will create the largest 3-D map of the universe’s galaxies and glean new insights about the universe’s accelerating expansion. This Dark Energy Spectroscopic Instrument (DESI) project will explore this expansion, driven by a mysterious property known as dark energy, in great detail. It could also make unexpected discoveries during its five-year mission.

Multiple Measurements close in on Dark Energy

May 6, 2019 12:00 pm

An extensive analysis of four different phenomena within the universe points the way to understanding the nature of dark energy, a collaboration between more than 100 scientists reveals. Dark energy – the force that propels the acceleration of the expanding universe – is a mysterious thing. It’s nature, write telescope scientist Timothy Abbott from the Cerro Tololo Inter-American Observatory, in Chile, and colleagues, “is unknown, and understanding its properties and origin is one of the principal challenges in modern physics”. Indeed, there is a lot at stake. Current measurements indicate that dark energy can be smoothly incorporated into the theory of general relativity as a cosmological constant; but, the researchers note, those measurements are far from precise and incorporate a wide range of potential variations.

Viewpoint: Dark Energy Faces Multiple Probes

May 1, 2019 12:00 pm

One of the top goals in cosmology today is understanding the dark energy that is responsible for the accelerated expansion of the Universe. Is the dark energy consistent with the cosmological constant of general relativity—representing a constant energy density filling space homogenously? Or can we find deviations from general relativity on cosmological scales that suggest a more complex nature for gravity? Questions like these motivate the current and next generations of surveys that aim to map out ever larger volumes of the Universe, using a wide variety of probes to constrain the properties of dark energy. The Dark Energy Survey (DES) has now derived such constraints from the combined analysis of four canonical observables related to dark energy: supernovae, baryon acoustic oscillations, gravitational lensing, and galaxy clustering [1]. The resulting bounds confirm what we knew from previous studies, which focused on single probes. But the results indicate that this multiprobe approach could allow surveys in the 2020s to improve such constraints by orders of magnitude, possibly bringing us close to solving the dark energy puzzle.

Supernovae, Dark Energy, and the Fate of Our Universe

April 5, 2019 12:00 pm

What’s the eventual fate of our universe? Is spacetime destined to continue to expand forever? Will it fly apart, tearing even atoms into bits? Or will it crunch back in on itself? New results from Dark Energy Survey supernovae address these and other questions. At present, the fabric of our universe is expanding — and not only that, but the its expansion is accelerating. To explain this phenomenon, we invoke what’s known as dark energy — an unknown form of energy that exists everywhere and exerts a negative pressure, driving the expansion. Since this idea was first proposed, we’ve conducted decades of research to better understand what dark energy is, how much of it there is, and how it influences our universe.

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