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Dark Energy Survey @TheDESurvey

RT @symmetrymag:Utilice nuestro mapa interactivo para obtener más información sobre física de partículas y astrofísica en América L… https://t.co/JTwq1OM7UG

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Dark Energy Survey @TheDESurvey

RT @ajshajib:Our paper measuring H_0 from a new strong lens is out on arXiv: https://t.co/gHhiaAz5JX. This very rare double-sou… https://t.co/Wz65BE4t3m

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Dark Energy Survey @TheDESurvey

A great thing about a project like DES is that it enables students to start careers in astronomy. I recently submit… https://t.co/mW1Z4hXSsJ

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Dark Energy Survey @TheDESurvey

RT @NASA:LIVE NOW: During today’s #AllWomanSpacewalk, we have helmet camera views so that you can see what @Astro_Christina… https://t.co/TR3nf23rMK

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Dark Energy Survey @TheDESurvey

#DESimages ("Galaxy Tango", credit: Erin Sheldon) https://t.co/cJK5m5Sdfp

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The Dark Energy Survey

7 hours ago

One of the great things about a project like DES is that it enables students like me to start new careers in astronomy. I've recently submitted my PhD thesis, finding strong gravitational lenses in DES data, and even got to go to the Very Large Telescope in Chile to observe some. Thanks DES! #DEST4TD

Thanks to Colin Jacobs (Swinburne University of Technology) for today's DES Thought for the Day! ... See MoreSee Less

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The Dark Energy Survey

3 days ago

#DESimages ("Galaxy Tango", credit: Erin Sheldon) ... See MoreSee Less

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The Dark Energy Survey

1 week ago

#DESimages (Field of galaxies centered on the bright spiral, NGC 1703, credit: Brian Yanny) ... See MoreSee Less

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The Dark Energy Survey shared a post.

1 week ago

2019 Nobel Laureate James Peebles’ insights into physical cosmology have enriched the entire field of research and laid a foundation for the transformation of cosmology over the last fifty years, from speculation to science. His theoretical framework, developed since the mid-1960s, is the basis of our contemporary ideas about the universe.

The Big Bang model describes the universe from its very first moments, almost 14 billion years ago, when it was extremely hot and dense. Since then, the universe has been expanding, becoming larger and colder. Barely 400,000 years after the Big Bang, the universe became transparent and light rays were able to travel through space. Even today, this ancient radiation is all around us and, coded into it, many of the universe’s secrets are hiding. Using his theoretical tools and calculations, James Peebles was able to interpret these traces from the infancy of the universe and discover new physical processes.

The results showed us a universe in which just five percent of its content is known, the matter which constitutes stars, planets, trees – and us. The rest, 95 percent, is unknown dark matter and dark energy. This is a mystery and a challenge to modern physics.

The 2019 Nobel Prize in Physics has been awarded with one half to James Peebles “for theoretical discoveries in physical cosmology” and the other half jointly to Michel Mayor and Didier Queloz “for the discovery of an exoplanet orbiting a solar-type star.”

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Popular information: bit.ly/2phPz1j
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The Dark Energy Survey

2 weeks ago

DES scientists Antonella Palmese, Marcelle Soares-Santos and Daniel Holz are featured in this story about the search for a rare black hole neutron star merger.

www.symmetrymagazine.org/article/chasing-gravitational-waves ... See MoreSee Less

Chasing gravitational waves

When LIGO and Virgo detected the echoes that likely came from a collision between a black hole and a neutron star, dozens of physicists began a hunt for the signal’s electromagnetic counterpart.

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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.

© 2019 The Dark Energy Survey