Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session H12: Invited Session: How Advanced Computational Resources Enhance Our Understanding of Physics |
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Sponsoring Units: DCOMP Chair: Peter Diener, Louisiana State University Room: Key 8 |
Sunday, April 12, 2015 8:30AM - 9:06AM |
H12.00001: The Standard Model of Nuclear Physics Invited Speaker: William Detmold At its core, nuclear physics, which describes the properties and interactions of hadrons, such as protons and neutrons, and atomic nuclei, arises from the Standard Model of particle physics. However, the complexities of nuclei result in severe computational difficulties that have historically prevented the calculation of central quantities in nuclear physics directly from this underlying theory. The availability of petascale (and prospect of exascale) high performance computing is changing this situation by enabling us to extend the numerical techniques of lattice Quantum Chromodynamics (LQCD), applied successfully in particle physics, to the more intricate dynamics of nuclear physics. In this talk, I will discuss this revolution and the emerging understanding of hadrons and nuclei within the Standard Model. [Preview Abstract] |
Sunday, April 12, 2015 9:06AM - 9:42AM |
H12.00002: Nicholas Metropolis Award for Outstanding Doctoral Thesis Work In Computational Physics Award Winner: Numerical Hydrodynamics at Gravity's Extremes Invited Speaker: William East Einstein's theory of general relativity is currently our best understanding of how gravity works. However, there are a very limited number of analytically-known solutions to the set of coupled, non-linear PDEs that make up the field equations. This means numerical methods are essential to understanding many interesting strong-field phenomena like black hole formation or the generation of gravitational waves. There has been great progress in the field of numerical relativity, especially in the past decade, not only in terms of being able to accurately simulate the mergers of compact objects like black holes or neutron stars, but beyond. I will discuss some recent work developing computational methods for simulating hydrodynamics coupled to Einstein gravity, and applying them to new regimes and problems in high-energy astrophysics, gravitational-wave astronomy, and theoretical general relativity. This includes developing flexible and robust methods for solving the constraint part of the Einstein field equations in order to specify initial data for an evolution, as well as an algorithm for efficiently evolving the full non-linear evolution equations when the solution is dominated by a known background solution. I will emphasize how these computational tools allow us to push the domain of numerical relativity into more extreme regimes of gravity: exploring mergers of black holes and neutron stars with high orbital eccentricity; simulating the extreme-mass-ratios involved in the tidal disruption of a star by a black hole using full relativity; and studying ultrarelativistic collisions, where the gravitational pull of kinetic energy is strong enough to form a black hole. [Preview Abstract] |
Sunday, April 12, 2015 9:42AM - 10:18AM |
H12.00003: Computing the universe: how large-scale simulations illuminate galaxies and dark energy Invited Speaker: Brian O'Shea High-performance and large-scale computing is absolutely to understanding astronomical objects such as stars, galaxies, and the cosmic web. This is because these are structures that operate on physical, temporal, and energy scales that cannot be reasonably approximated in the laboratory, and whose complexity and nonlinearity often defies analytic modeling. In this talk, I show how the growth of computing platforms over time has facilitated our understanding of astrophysical and cosmological phenomena, focusing primarily on galaxies and large-scale structure in the Universe. [Preview Abstract] |
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