Understanding Dark Energy

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PostWed Oct 28, 2009 2:34 am » by -Marduk-


Scientists use world’s fastest supercomputer to model origins of the unseen universe

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Understanding dark energy is the number one issue in explaining the universe, according to Salman Habib, of the Laboratory’s Nuclear and Particle Physics, Astrophysics and Cosmology group.

“Because the universe is expanding and at the same time accelerating, either there is a huge gap in our understanding of physics, or there is a strange new form of matter that dominates the universe – ‘dark energy’ – making up about 70 percent of it,” said Habib. “In addition, there is five times more of an unknown ‘dark matter’ than there is ordinary matter in the universe, and we know it’s there from many different observations, most spectacularly, we’ve seen it bend light in pictures from the Hubble Space Telescope, but its origin is also not understood.”

Even though it’s looking at only a small segment of the “accessible” universe, Habib’s “Roadrunner Universe” model requires a petascale computer because, like the universe, it’s mind-bendingly large. The model’s basic unit is a particle with a mass of approximately one billion suns (in order to sample galaxies with masses of about a trillion suns), and it includes 64 billion and more of those particles.

The model is one of the largest simulations of the distribution of matter in the universe, and aims to look at galaxy-scale mass concentrations above and beyond quantities seen in state-of-the-art sky surveys.

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About Roadrunner, the world's fastest supercomputer, first to break the petaflop barrier

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On Memorial Day, May 26, 2008, the "Roadrunner" supercomputer exceeded a sustained speed of 1 petaflop/s, or 1 million billion calculations per second. "Petaflop/s" is computer jargon—peta signifying the number 1 followed by 15 zeros (sometimes called a quadrillion) and flop/s meaning "floating point operation per second." Shortly after that it was named the world's fastest supercomputer by the TOP500 organization at the June 2008 International Supercomputing Conference in Dresden Germany.

The Roadrunner supercomputer, developed by IBM in partnership with the Laboratory and the National Nuclear Security Administration, will be used to perform advanced physics and predictive simulations in a classified mode to assure the safety, security, and reliability of the U.S. nuclear deterrent. The system will be used by scientists at the NNSA's Los Alamos, Sandia, and Lawrence Livermore national laboratories.

The secret to its record-breaking performance is a unique hybrid design. Each compute node in this cluster consists of two AMD Opteron dual-core processors plus four PowerXCell 8 processors used as computational accelerators. The accelerators used in Roadrunner are a special IBM-developed variant of the Cell processor used in the Sony PlayStation 3. The node-attached Cell accelerators are what make Roadrunner different than typical clusters.

Roadrunner is still currently the world's fastest with a speed of 1.105 petaflop/s per second, according to the TOP500 announcement at the November 2008 Supercomputing Conference in Austin Texas, and it again retained the #1 position at the June ISC09 conference.
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PostWed Oct 28, 2009 2:50 am » by Spock


Awesome. I hope this stays up.

I got to go to bed!!!!!! My bad - I just turned 29 again.

Thanks for posting Marduck - will trip on it tomorrow.

jetxvii

PostWed Oct 28, 2009 3:07 am » by jetxvii


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PostWed Oct 28, 2009 3:10 am » by -Marduk-


spock wrote:Awesome. I hope this stays up.

I got to go to bed!!!!!! My bad - I just turned 29 again.

Thanks for posting Marduck - will trip on it tomorrow.


Nite Spock Image
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PostWed Oct 28, 2009 10:03 pm » by Lucidlemondrop


1. The Black Madonna is Dark and calls us to the darkness.. Darkness is something we need to get used to again—the “Enlightenment” has deceived us into being afraid of the dark and distant from it. Light switches are illusory. They feed the notion that we can “master nature” (Descartes’ false promise) and overcome all darkness with a flick of our finger.
Meister Eckhart observes that “the ground of the soul is dark.”[3] Thus to avoid the darkness is to live superficially, cut off from one’s ground, one’s depth. The Black Madonna invites us into the dark and therefore into our depths. This is what the mystics call the “inside” of things, the essence of things. This is where Divinity lies. It is where the true self lies. It is where illusions are broken apart and the truth lies. Andrew Harvey puts it this way: “The Black Madonna is the transcendent Kali-Mother, the black womb of light out of which all of the worlds are always arising and into which they fall, the presence behind all things, the darkness of love and the loving unknowing into which the child of the Mother goes when his or her illumination is perfect.” [4] She calls us to that darkness which is mystery itself. She encourages us to be at home there, in the presence of deep, black, unsolveable mystery. She is, in Harvey’s words, “the blackness of divine mystery, that mystery celebrated by the great Aphophatic mystics, such as Dionysisus Areopagite, who see the divine as forever unknowable, mysterious, beyond all our concepts, hidden from all our senses in a light so dazzling it registers on them as darkness.” [5] Eckhart calls God’s darkness a “superessential darkness, a mystery behind mystery, a mystery within mystery that no light has penetrated.”[6]
To honor darkness is to honor the experience of people of color. [7] Its opposite is racism. The Black Madonna invites us to get over racial stereotypes and racial fears and projections and to go for the dark.


http://www.matthewfox.org/sys-tmpl/theblackmadonna/

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What a long strange trip it's been..............



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