Bulletin of the American Physical Society
2008 Annual Meeting of the Division of Nuclear Physics
Volume 53, Number 12
Thursday–Sunday, October 23–26, 2008; Oakland, California
Session 1WB: Workshop: From Quarks to the Cosmos with Petaflops: Large-Scale Computation in Nuclear Physics |
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Chair: Jutta Escher and Ron Solz, Lawrence Livermore National Laboratory Room: Jewett Ballroom ABC |
Thursday, October 23, 2008 8:30AM - 9:05AM |
1WB.00001: Petascale Architectures for Nuclear Physics Computation Invited Speaker: The next few years will be a time of considerable innovation in computer architectures as efforts expand to develop petascale and exascale systems for all computational disciplines. On the top 500 list, the first sustained petaflop system has now been delivered at Los Alamos National Laboratory. The technology challenges to the delivery of sustained petaflop computational capability are both significant and surprising. Power, memory capacity, data management, and reliability are emerging as critical system issues for the production use of petascale systems. High performance software libraries and middleware environments are now essential to enable application development and deployment for production computational use. This paper presents the current status of systems architectures for petascale computing, and discusses the approaches which are emerging to deliver effective, productive petascale solutions. [Preview Abstract] |
Thursday, October 23, 2008 9:05AM - 9:40AM |
1WB.00002: Recent Developments in Lattice QCD Invited Speaker: Lattice QCD is rapidly evolving toward the calculation of nonperturbative strong interaction observables at the physical quark masses with complete control over systematic uncertainties. I will outline the recent progress that has been made in the field, both at finite and zero temperature. Further, I will present progress in calculating the interactions between hadrons, and present estimates of the computational needs for nuclear physics. [Preview Abstract] |
Thursday, October 23, 2008 9:40AM - 10:15AM |
1WB.00003: Ab initio nuclear structure - advances and challenges Invited Speaker: I will present an overview of recent advances in ab-initio methods used in p-shell nuclei and beyond. The main focus will be on Greens Function Monte Carlo (GFMC), Coupled Cluster (CC) and the No-Core Shell Model (NCSM). I will introduce Chiral Effective Field Theory (EFT) Hamiltonians that provide a bridge between QCD and non-relativistic nucleon-nucleon and multi-nucleon interactions. Leadership-class supercomputers play a key role in achieving these results and I will show some measures of performance. Major physics accomplishments and new challenges will round out the overview. [Preview Abstract] |
Thursday, October 23, 2008 10:15AM - 10:40AM |
1WB.00004: COFFEE BREAK
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Thursday, October 23, 2008 10:40AM - 11:15AM |
1WB.00005: Computational perspectives in nuclear reactions Invited Speaker: Nuclear reactions are crucial to probe the structure of nuclei, in particular for unstable systems. They can also provide important astrophysical information. However, it is only in the last decade, as a wider variety of mechanisms are consistently included in the reaction model and more structure information is taken into account, that modelling nuclear reactions has become computationally intensive. In this talk I will give a snapshot of the state of the art calculations including some results on breakup and transfer reactions with light exotic nuclei. I will show some results on performance and will discuss the degree of parallelism in the codes as well as the bottlenecks we need to resolve when scaling up to Petaflops machines. Finally, I will conclude with a vision of where we would like to be in a decade. [Preview Abstract] |
Thursday, October 23, 2008 11:15AM - 11:50AM |
1WB.00006: Computational Supernovae: Nuclear Astrophysics' Grand Challenge Invited Speaker: To address the theoretical supernova explosion problem with physical fidelity requires the development and use of sophisticated numerical radiation/hydrodynamic codes that simulate the multi-dimensional flow in a variety of Mach-number regimes. Though the latest simulations incorporate rotation, multi-group radiative transfer, and magnetic fields, they are not yet general-relativistic, do not solve the Boltzmann equation in its full multi-D context, and are not fully 3D in space. One must eventually do the calculations in six-dimenional phase space (plus time), and such seven-dimenisonal calculations are currently beyond reach. Nevertheless, there has been much recent progress and this progress has been informed by numerical experiments that will only get better in the next 3-5 years. In this talk, I will discuss the latest physical ideas in the theory of the mechanism of core-collapse supernovae and the variety of results that have emerged from recent massive computations. Moreover, I will motivate what more may need to be done to solve in credible fashion the enigma of stellar death and supernova explosion. [Preview Abstract] |
Thursday, October 23, 2008 11:50AM - 12:25PM |
1WB.00007: Opportunities for Nuclear Physics to benefit from Grid Computing Invited Speaker: Over the last few years, large globally distributed compute and storage infrastructures have emerged. These ``grid infrastructures'' are ideally suited for high throughput computing, and are used in a variety of scientific domains, especially experimental particle physics. I will discuss the Open Science Grid infrastructure, and how it is used, by giving successful examples, some of which are taken from Nuclear Physics. This will provide an introduction to the technology, as well as the services available to adopt legacy applications to the grid. [Preview Abstract] |
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