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Primeur weekly 2011-07-18

The Cloud

Rutgers-led experts assemble globe-spanning supercomputer Cloud ...

IBM debuts Cloud-based analytics suite to help companies boost marketing results ...

HP accelerates customers' path to open, hybrid Cloud ...

IBM expands business in Japan with new Cloud data centres ...

VMware unveils VMware vSphere 5 and comprehensive Cloud infrastructure suite ...

Panaya reaches 2,000 ERP systems milestone ...

VMware introduces VMware vSphere Storage Appliance to further simplify IT for small and midsized businesses ...

ET Water celebrates smart irrigation month with the launch of the GNOME Smart Irrigation Calculator ...

From end-user to data centre: Cisco enhances Cloud computing performance, efficiency and security ...

Desktop Grids

Version 4.2.4 of OurGrid middleware released ...

XtremWeb-HEP 7.5.0 released ...

EuroFlash

Lomonosov supercomputer sets world record for performance on Graph500 benchmark ...

European Commission to organize Information Day on Cloud Computing, Internet of Services and Advanced Software Engineering ...

Bright Cluster Manager selected by Freie Universitaet Berlin to manage new Dell-based HPC system ...

Eurotech to receive 4 million euro order from Selex Elsag for Aurora HPC for cyber security applications ...

Medicsight and Ziooft partner in U.S. to offer computer-aided detection with supercomputing functional analytics ...

Imec achieves breakthroughs in enabling future DRAM and RRAM ...

USFlash

IBM Power Systems running Linux outperform competition on standard benchmarks ...

Drexel University chose advanced HPC and Bright Cluster Manager to help unravel the mysteries of the Universe and the world of molecular dynamics ...

Moving data at the speed of science: Berkeley Lab lays foundation for 100 Gbps prototype network ...

Scientists model physics of a key dark-energy probe ...

SDSC visualizations win 'OASCR' Awards at SciDAC 2011 ...

SDSC's Trestles provides rapid turnaround and enhanced performance for diverse researchers ...

Sandia's 'cooler' technology offers fundamental breakthrough in heat transfer ...

Changsha National Supercomputing Center inaugurated ...

Oracle introduces Oracle Exadata Storage Expansion Rack ...

University of Virginia's Olivier Pfister accomplishes breakthrough toward quantum computing ...

GNS Healthcare collaborates with NCI in new approach to lung cancer: supercomputer analysis to aid in matching targeted drugs to patients ...

Wolfram Research announces gridMathematica 8: Adding the power of CUDA over the Grid ...

UC Irvine study points to new approach to influenza's antiviral resistance ...

basysKom, Codero, Gluster and Nixu Open join The Linux Foundation ...

Stanford engineers build a nanoscale device for brain-inspired computing ...

NVIDIA names Stanford University a CUDA Center of Excellence ...

NIST prototype 'optics table on a chip' places microwave photon in 2 colours at once ...

Scientists model physics of a key dark-energy probe

12 Jul 2011 Columbus - Ohio State University (OSU) researchers are leveraging powerful supercomputers to investigate one of the key observational probes of "dark energy", the mysterious energy form that is causing the expansion of the universe to accelerate over time.

The OSU project, led by Chris Orban, a graduate research fellow in physics at Ohio State's Center for Cosmology and Astro-Particle Physics, focuses on simulations created on Ohio Supercomputer Center (OSC) systems to simplify and better characterize a subtle dark matter clustering feature. The new model allows cosmologists to gain a more accurate understanding of certain aspects of large-scale structure, such as the effect of the expansion of the universe on the growth of density fluctuations.

"Knowing how the dark matter 'reacts' to the expansion of the universe is crucial for learning the most about dark energy and dark matter from large astronomical surveys like the Sloan Digital Sky Survey, of which OSU is a collaborating member", stated Chris Orban. "In particular, there is a subtle clustering feature seen in this data set called 'Baryon Acoustic Oscillations' (BAO), which turns out to be very useful for constraining cosmological parameters like the equation of state of dark energy."

The oscillations come from fluctuations in the distribution of hot plasma in the early universe; researchers can identify this feature by measuring the cosmic microwave background.

"The BAO signature gets imprinted on the dark matter very early on, but the feature changes over cosmic time, potentially biasing its use as a cosmological tool", Chris Orban explained. "It's a complicated non-linear problem, and physicists are very fond of simplifying complicated problems to gain a more in-depth understanding. This is exactly what we did for the first time, in our paper, using N-body simulations."

"For current state-of-the-art astronomical surveys, the main non-linear effects that we investigate in the paper are negligible compared to other sources of error, but next-generation surveys will need to be far more sophisticated in this regard", stated Chris Orban's academic advisor, David Weinberg, Ph.D., who is a professor of astronomy at OSU and the project scientist for the Sloan Survey. "This places the utmost importance on making reliable and precise predictions for these non-linear effects, a task which cosmological N-body simulations are in many ways well-suited to do."

Since early 2009, Chris Orban and David Weinberg have employed nearly 200,000 processor-hours of computational time on the OSC's flagship Glenn Cluster and eight terabytes of storage space on its Mass Storage Environment. The Glenn Cluster offers researchers more than 9,600 Opteron cores, 24 terabytes of memory and a peak computational capability of 75 teraflops - which translates to 75 trillion calculations per second.

For software, the researchers employed the state-of-the-art Gadget-2 N-body code to calculate the trajectories of more than a hundred million particles, and set the initial conditions using the 2LPT code developed by their collaborators at New York University.

"This research project represents a fantastic conjunction of people and disciplines", observed Ashok Krishnamurthy, co-executive director of OSC. "It brought together professionals in the fields of physics, astronomy and computational science to produce impressive results that might not otherwise have come together for many years. OSC is proud to have contributed to these achievements."

Chris Orban and David Weinberg authored a paper on this research, "Self-similar Bumps and Wiggles: Isolating the Evolution of the BAO Peak with Power-law Initial Conditions", which is slated for publication in the journalPhysical Review D. The project is supported by funding from the National Science Foundation.

"We're both pretty proud of the final product, which we’ve been working on for about two and a half years", Chris Orban stated. "Our production runs represent by far the largest set of cosmological simulations ever performed at The Ohio State University."
Source: Ohio Supercomputing Center

Back to Table of contents

Primeur weekly 2011-07-18

The Cloud

Rutgers-led experts assemble globe-spanning supercomputer Cloud ...

IBM debuts Cloud-based analytics suite to help companies boost marketing results ...

HP accelerates customers' path to open, hybrid Cloud ...

IBM expands business in Japan with new Cloud data centres ...

VMware unveils VMware vSphere 5 and comprehensive Cloud infrastructure suite ...

Panaya reaches 2,000 ERP systems milestone ...

VMware introduces VMware vSphere Storage Appliance to further simplify IT for small and midsized businesses ...

ET Water celebrates smart irrigation month with the launch of the GNOME Smart Irrigation Calculator ...

From end-user to data centre: Cisco enhances Cloud computing performance, efficiency and security ...

Desktop Grids

Version 4.2.4 of OurGrid middleware released ...

XtremWeb-HEP 7.5.0 released ...

EuroFlash

Lomonosov supercomputer sets world record for performance on Graph500 benchmark ...

European Commission to organize Information Day on Cloud Computing, Internet of Services and Advanced Software Engineering ...

Bright Cluster Manager selected by Freie Universitaet Berlin to manage new Dell-based HPC system ...

Eurotech to receive 4 million euro order from Selex Elsag for Aurora HPC for cyber security applications ...

Medicsight and Ziooft partner in U.S. to offer computer-aided detection with supercomputing functional analytics ...

Imec achieves breakthroughs in enabling future DRAM and RRAM ...

USFlash

IBM Power Systems running Linux outperform competition on standard benchmarks ...

Drexel University chose advanced HPC and Bright Cluster Manager to help unravel the mysteries of the Universe and the world of molecular dynamics ...

Moving data at the speed of science: Berkeley Lab lays foundation for 100 Gbps prototype network ...

Scientists model physics of a key dark-energy probe ...

SDSC visualizations win 'OASCR' Awards at SciDAC 2011 ...

SDSC's Trestles provides rapid turnaround and enhanced performance for diverse researchers ...

Sandia's 'cooler' technology offers fundamental breakthrough in heat transfer ...

Changsha National Supercomputing Center inaugurated ...

Oracle introduces Oracle Exadata Storage Expansion Rack ...

University of Virginia's Olivier Pfister accomplishes breakthrough toward quantum computing ...

GNS Healthcare collaborates with NCI in new approach to lung cancer: supercomputer analysis to aid in matching targeted drugs to patients ...

Wolfram Research announces gridMathematica 8: Adding the power of CUDA over the Grid ...

UC Irvine study points to new approach to influenza's antiviral resistance ...

basysKom, Codero, Gluster and Nixu Open join The Linux Foundation ...

Stanford engineers build a nanoscale device for brain-inspired computing ...

NVIDIA names Stanford University a CUDA Center of Excellence ...

NIST prototype 'optics table on a chip' places microwave photon in 2 colours at once ...