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The universe in a cube

New model, spanning 13 billion years of cosmic evolution, makes important advances.
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Screenshot of the Illustris Simulation that shows what the universe looks like 12.2 billion years after the Big Bang.
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Caption: Screenshot of the Illustris Simulation that shows what the universe looks like 12.2 billion years after the Big Bang.
Credits: Courtesy of Mark Vogelsberger

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Screenshot of the Illustris Simulation that shows what the universe looks like 12.2 billion years after the Big Bang.
Caption:
Screenshot of the Illustris Simulation that shows what the universe looks like 12.2 billion years after the Big Bang.
Credits:
Courtesy of Mark Vogelsberger

A massive computer simulation has produced a model of the universe’s evolution with new accuracy in some important measures — and yielded a new prediction concerning the distribution of matter in the cosmos.

The new Illustris model, constructed by researchers at several institutions, including MIT, simulates 13 billion years of cosmic evolution, and has generated a new degree of fidelity for certain observed features of the universe. These features include the frequency with which galaxies of different shapes occur in the universe, as well as the preponderance of certain elements in space.

“With this model, we are able to get agreement with observational data on small scales and large scales,” says Mark Vogelsberger, an assistant professor of physics at MIT and first author of a new paper in the journal Nature that describes the modeling effort.

While modeling 41,416 galaxies in all, the simulation closely matches the rate at which certain types of galaxies develop across the universe as a whole.

“Some galaxies are more elliptical and some are more like the Milky Way, [spiral] disc-type galaxies,” Vogelsberger explains. “There is a certain ratio in the universe. We get the ratio right. That was not achieved before.”

In another area, the model predicts that supernovas, among other phenomena, have helped redistribute matter throughout the universe to a degree that affects the interpretation of future precision tests of cosmology conducted by space-based telescopes, such as NASA’s WFIRST survey, and EUCLID, the European Space Agency’s program. Such predictions are one of the benefits of refining models: When researchers construct models that are accurate in several known respects, those models provide a platform for related new predictions as well.

A cube of light years

The model represents a cube-shaped piece of the universe that is 350 million light-years long on each side. Yet it also produces features at a much smaller scale, just 1,000 light-years. The model’s initial conditions represent those of the universe when it was 12 million years old, and then simulates the next 13.8 billion years of change in the cosmos. 

The model contains 12 billion visual “resolution elements,” and includes so much data that it had to be run over a span of months at multiple computing centers.

The resolution elements mean that the researchers could create visual pictures from the simulation, and compare those to the visual images of the known universe.

“You can take a virtual Hubble Space Telescope and look through the simulation, as it were,” Vogelsberger says.

Among other features of cosmic evolution whose descriptions conform closely to empirical evidence, the model accurately describes the richness of neutral hydrogen as a function of the stellar mass of galaxies.

While Vogelsberger believes the simulation worked well — “The model is more successful than we anticipated,” he says — he recognizes that it also has room for improvement.

For one thing, “Low-mass galaxies just form too early in the simulation,” Vogelsberger says. And while the size of the simulation makes it impractical to quickly test adjustments to the model, Vogelsberger says he and his colleagues are mindful of ways in which it might be refined.

Galaxies that look like our own

Other scientists working in this area say the model represents a step forward for the field. “For the past two decades, cosmologists have been unable to produce galaxies like the Milky Way in their simulations,” says David Spergel, a professor of astronomy at Princeton University. “We have long debated whether this failure was due to complex dark matter physics, unknown stellar feedbacks, or the difficulties in simulating the highly non-linear multi-scale process of galaxy formation … With their simulations, [the researchers] finally produce galaxies that look like our own.”

In the future, suggests Spergel, “The success of these simulations will enable much more detailed comparisons between observations of the distribution of stars and dark matter in the Milky Way and observations.”

The paper, “Properties of galaxies reproduced by a hydrodynamic simulation,” was co-written by 10 authors at several institutions: the Harvard-Smithsonian Center for Astrophysics (CfA); the Heidelberg Institute for Theoretical Studies in Germany; the University of Heidelberg; the Kavli Institute for Cosmology and the Institute of Astronomy, both in Cambridge, England; the Space Telescope Science Institute in Baltimore; and the Institute for Advanced Study in Princeton, N.J.

The computing centers used to run the simulation were the Harvard Odyssey and CfA/ITC cluster; the Ranger and Stampede supercomputers at the Texas Advanced Computing Center; the CURIE supercomputer at CEA/France; and the SuperMUC computer at the Leibniz Computing Centre in Germany.

Support for the research came from the German Research Foundation, the European Research Council, NASA, and the Alexander von Humboldt Foundation in Germany.

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The new Illustris Simulation simulates 13 billion years of cosmic evolution and has generated a new degree of fidelity for certain observed features of the universe.

Press Mentions

The New York Times

Dennis Overbye of The New York Times writes about Illustris, a calculation by Professor Mark Vogelsberger’s team that mathematically models how dark matter evolved from its initial, uniform cloud. They found “the closest match yet between dark matter models and the distribution and types of galaxies in the visible universe,” writes Overbye.

Salon

“The goal of the simulation is to compare the actual cosmos — viewable via telescope — to the computer-created universe. The comparison will allow scientists to test if their theories on the creation of the universe work,” Salon reporter Sarah Gray writes of Illustris.

Los Angeles Times

Los Angeles Times reporter Deborah Netburn writes about the computer model developed to model the universe. The model is so accurate that, “a mock observation of galaxies from the Illustris model could pass for an image taken by the Hubble Ultra Deep Field Space Telescope,” Netburn reports.

BBC News

Pallab Ghosh reports for BBC News on the new computer model of the universe developed by researchers from MIT and other institutions around the world.

MSNBC

“The invisible web of dark matter and energy tying the universe together is recreated to the best of our knowledge, and the elements that make up stars and planets can be observed forming and coalescing,” Coldewey writes in an MSNBC article about Illustris.

Wired

Wired reporter Adam Mann writes about Illustris, the new computer model developed to model the history of the universe. Illustris can handle all elements of the universe’s 330 million light-year span, Mann reports. 

Scientific American

In an article posted on the Scientific American website, Elizabeth Gibney details the new computer model developed to simulate the Universe.

Associated Press

The Associated Press reports on the new computer model of the universe developed by a team of researchers led by MIT Professor Mark Vogelsberger.

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