Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session H05: Building the Bridge to Exascale Computing: Applications and Opportunities for Nuclear PhysicsInvited
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Sponsoring Units: DNP DCOMP Chair: Dean Lee, FRIB and Michigan State University Room: Sheraton Governor's Square 14 |
Sunday, April 14, 2019 10:45AM - 11:21AM |
H05.00001: Nuclear Astrophysics approaching the Exascale: Multi-physics simulations of stellar explosions and their nucleosynthesis Invited Speaker: Bronson Messer Multi-physics simulations of stellar explosions (such as supernovae and neutron star mergers) are one of the most important avenues available to address fundamental questions in nuclear astrophysics, such as the cosmic origin of the elements, the behavior of matter and neutrinos at extreme densities, the structure and evolution of compact objects, and the sources of gravitational waves. ExaStar is an application development project within DOE's Exascale Computing Project (ECP). ExaStar is working to deliver an efficient, versatile, and portable code suite for multi-physics astrophysics simulations run on exascale machines. The project builds on the capabilities of current simulation codes (including FLASH and Castro), is based on the adaptive mesh refinement framework AMReX, and will include modules for hydrodynamics, spectral radiation (neutrino) transport, nuclear reactions, and microphysics. This presentation will outline recent progress towards understanding some of the aforementioned nuclear astrophysics questions that has been enabled by ExaStar development, as well as providing a description of what we hope to learn at the exascale. |
Sunday, April 14, 2019 11:21AM - 11:57AM |
H05.00002: Nuclear Structure approaching the Exascale: large scale ab initio calculations Invited Speaker: Saori Pastore In this talk, I will summarize recent developments in ab initio Quantum Monte Carlo calculations of electroweak structure and reactions, with emphasis on single and double beta decays, and lepton-scattering off nuclei. |
Sunday, April 14, 2019 11:57AM - 12:33PM |
H05.00003: Lattice QCD for nuclear physics at the Exascale Invited Speaker: André P Walker-Loud We are engaged in an intense search for new physics from beyond the Standard Model, both with high-energy colliders and through precision low-energy tests. At low-energy, nuclei are the laboratories as probes for new physics, for example, the search for neutrinoless double beta decay and permanent electric dipole moments of large nuclei. If we are to accurately interpret the results of these experiments as constraints on new physics, we must build a quantitative theoretical bridge between nuclear physics and QCD. The non-perturbative nature of QCD requires the use of high-performance computers to compute even the simplest properties of nucleons and the interactions of few nucleon systems by utilizing lattice QCD. These results must then be coupled to low-energy effective theories of nuclear physics, such that the theoretical uncertainty from QCD can be propagated to our understanding of nuclei and their properties. Through the development of new ideas, sophisticated software, and more complex heterogenous computing architectures, we are making continual progress towards understanding nuclear physics directly from QCD. The latest generation of computers, such as Summit, are disruptively faster than previous generations. Efficiently utilizing these new machines requires more sophisticated management software, as the application to nuclear physics will require millions of samples to render the stochastic uncertainties under control. I will highlight some recent results and provide a perspective on the exciting opportunities that lie ahead as we move towards the exascale computing era. |
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