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Primeur weekly 2016-11-07

Focus

EGI to finalize service catalogue and ISO certification ...

Exascale supercomputing

SLAC and Berkeley Lab researchers prepare for scientific computing on the exascale ...

Quantum computing

Researchers nearly reached quantum limit with nanodrums ...

Focus on Europe

New approach for ARM-based technology to halve the cost of powering data centres ...

PRACE to award contracts in third and final phase of Pre-Commercial Procurement (PCP) ...

PRACE welcomes new Managing Director Serge Bogaerts ...

PRACE 2016 Digest Special Edition on Industry is out ...

Supercomputer comes up with a profile of dark matter ...

Middleware

Bright Computing supplies Bright OpenStack to Stony Brook University ...

DDN Annual High Performance Computing Trends survey reveals rising deployment of flash tiers and private/hybrid Clouds versus public for HPC ...

With Corral 3, TACC provides a more unified data structure and increased space ...

Hardware

Mellanox launches open source software initiative for routers, load balancers, and firewalls ...

Mellanox Multi-Host technology reshapes data centre economics ...

Cray awarded $26 million contract from the Department of Defense High Performance Computing Modernization Programme ...

Hewlett Packard Enterprise completes acquisition of SGI ...

Centre for Modelling & Simulation in Bristol launches new supercomputer ...

Baylor University selects Cray CS400 cluster supercomputer to power innovative research ...

SGI awarded $27 million systems contract with the Army Research Laboratory Defense Supercomputing Resource Center ...

Applications

XSEDE spins off annual conference to unite research computing community ...

Researchers at UCSB explore the delicate balance between coherence and control with a simple but complete platform for quantum processing ...

Cosmic connection: KITP's Greg Huber worked with nuclear physicists to confirm a structural similarity found in both human cells and neutron stars ...

New technique for creating NV-doped nanodiamonds may be boost for quantum computing ...

New bacteria groups, and stunning diversity, discovered underground ...

The Cloud

IBM drives Cloud storage with new all-flash and software defined solutions ...

Capital markets firms continue to invest in hardware for compute Grids alongside growing Cloud adoption, according to TABB Group Research ...

Supercomputer comes up with a profile of dark matter


Simulated distribution of dark matter approximately three billion years after the Big Bang (illustration not from this work). Credit: The Virgo Consortium/Alexandre Amblard/ESA.
2 Nov 2016 Hamburg - In the search for the mysterious dark matter, physicists have used elaborate computer calculations to come up with an outline of the particles of this unknown form of matter. To do this, the scientists extended the successful Standard Model of particle physics which allowed them, among other things, to predict the mass of so-called axions, promising candidates for dark matter. The German-Hungarian team of researchers led by Professor Zoltán Fodor of the University of Wuppertal, Eötvös University in Budapest and Forschungszentrum Jülich carried out its calculations on Jülich's supercomputer JUQUEEN (BlueGene/Q) and presents its results in the journalNature.

"Dark matter is an invisible form of matter which until now has only revealed itself through its gravitational effects. What it consists of remains a complete mystery", explained co-author Dr. Andreas Ringwald, who is based at DESY and who proposed the current research. Evidence for the existence of this form of matter comes, among other things, from the astrophysical observation of galaxies, which rotate far too rapidly to be held together only by the gravitational pull of the visible matter. High-precision measurements using the European satellite "Planck" show that almost 85 percent of the entire mass of the universe consists of dark matter. All the stars, planets, nebulae and other objects in space that are made of conventional matter account for no more than 15 percent of the mass of the universe.

"The adjective 'dark' does not simply mean that it does not emit visible light", stated Andreas Ringwald. "It does not appear to give off any other wavelengths either - its interaction with photons must be very weak indeed." For decades, physicists have been searching for particles of this new type of matter. What is clear is that these particles must lie beyond the Standard Model of particle physics, and while that model is extremely successful, it currently only describes the conventional 15 percent of all matter in the cosmos. From theoretically possible extensions to the Standard Model physicists not only expect a deeper understanding of the universe, but also concrete clues in what energy range it is particularly worthwhile looking for dark-matter candidates.

The unknown form of matter can either consist of comparatively few, but very heavy particles, or of a large number of light ones. The direct searches for heavy dark-matter candidates using large detectors in underground laboratories and the indirect search for them using large particle accelerators are still going on, but have not turned up any dark matter particles so far. A range of physical considerations make extremely light particles, dubbed axions, very promising candidates. Using clever experimental set-ups, it might even be possible to detect direct evidence of them. "However, to find this kind of evidence it would be extremely helpful to know what kind of mass we are looking for", emphasised theoretical physicist Andreas Ringwald. "Otherwise the search could take decades, because one would have to scan far too large a range."

The existence of axions is predicted by an extension to quantum chromodynamics (QCD), the quantum theory that governs the strong interaction, responsible for the nuclear force. The strong interaction is one of the four fundamental forces of nature alongside gravitation, electromagnetism and the weak nuclear force, which is responsible for radioactivity. "Theoretical considerations indicate that there are so-called topological quantum fluctuations in quantum chromodynamics, which ought to result in an observable violation of time reversal symmetry", explained Andreas Ringwald. This means that certain processes should differ depending on whether they are running forwards or backwards. However, no experiment has so far managed to demonstrate this effect.

The extension to quantum chromodynamics (QCD) restores the invariance of time reversals, but at the same time it predicts the existence of a very weakly interacting particle, the axion, whose properties, in particular its mass, depend on the strength of the topological quantum fluctuations. However, it takes modern supercomputers like Jülich's JUQUEEN to calculate the latter in the temperature range that is relevant in predicting the relative contribution of axions to the matter making up the universe. "On top of this, we had to develop new methods of analysis in order to achieve the required temperature range", noted Zoltán Fodor who led the research.

The results show, among other things, that if axions do make up the bulk of dark matter, they should have a mass of 50 to 1500 micro-electronvolts, expressed in the customary units of particle physics, and thus be up to ten billion times lighter than electrons. This would require every cubic centimetre of the universe to contain on average ten million such ultra-lightweight particles. Dark matter is not spread out evenly in the universe, however, but forms clumps and branches of a weblike network. Because of this, our local region of the Milky Way should contain about one trillion axions per cubic centimetre.

Thanks to the Jülich supercomputer, the calculations now provide physicists with a concrete range in which their search for axions is likely to be most promising. "The results we are presenting will probably lead to a race to discover these particles", stated Zoltán Fodor. Their discovery would not only solve the problem of dark matter in the universe, but at the same time answer the question why the strong interaction is so surprisingly symmetrical with respect to time reversal. The scientists expect that it will be possible within the next few years to either confirm or rule out the existence of axions experimentally.

The Institute for Nuclear Research of the Hungarian Academy of Sciences in Debrecen, the Lendület Lattice Gauge Theory Research Group at the Eötvös University, the University of Zaragoza in Spain, and the Max Planck Institute for Physics in Munich were also involved in the research.

The paper titled "Calculation of the axion mass based on high-temperature lattice quantum chromodynamics" is authored by S. Borsanyi, Z. Fodor, J. Gunther, K.-H. Kampert, S. D. Katz, T. Kawanai, T. G. Kovacs, S. W. Mages, A. Pasztor, F. Pittler, J. Redondo, A. Ringwald & K. K. Szabo and has been published in Nature , 2016; DOI: 10.1038/nature20115.
Source: Deutsches Elektronen-Synchrotron - DESY

Back to Table of contents

Primeur weekly 2016-11-07

Focus

EGI to finalize service catalogue and ISO certification ...

Exascale supercomputing

SLAC and Berkeley Lab researchers prepare for scientific computing on the exascale ...

Quantum computing

Researchers nearly reached quantum limit with nanodrums ...

Focus on Europe

New approach for ARM-based technology to halve the cost of powering data centres ...

PRACE to award contracts in third and final phase of Pre-Commercial Procurement (PCP) ...

PRACE welcomes new Managing Director Serge Bogaerts ...

PRACE 2016 Digest Special Edition on Industry is out ...

Supercomputer comes up with a profile of dark matter ...

Middleware

Bright Computing supplies Bright OpenStack to Stony Brook University ...

DDN Annual High Performance Computing Trends survey reveals rising deployment of flash tiers and private/hybrid Clouds versus public for HPC ...

With Corral 3, TACC provides a more unified data structure and increased space ...

Hardware

Mellanox launches open source software initiative for routers, load balancers, and firewalls ...

Mellanox Multi-Host technology reshapes data centre economics ...

Cray awarded $26 million contract from the Department of Defense High Performance Computing Modernization Programme ...

Hewlett Packard Enterprise completes acquisition of SGI ...

Centre for Modelling & Simulation in Bristol launches new supercomputer ...

Baylor University selects Cray CS400 cluster supercomputer to power innovative research ...

SGI awarded $27 million systems contract with the Army Research Laboratory Defense Supercomputing Resource Center ...

Applications

XSEDE spins off annual conference to unite research computing community ...

Researchers at UCSB explore the delicate balance between coherence and control with a simple but complete platform for quantum processing ...

Cosmic connection: KITP's Greg Huber worked with nuclear physicists to confirm a structural similarity found in both human cells and neutron stars ...

New technique for creating NV-doped nanodiamonds may be boost for quantum computing ...

New bacteria groups, and stunning diversity, discovered underground ...

The Cloud

IBM drives Cloud storage with new all-flash and software defined solutions ...

Capital markets firms continue to invest in hardware for compute Grids alongside growing Cloud adoption, according to TABB Group Research ...