Bulletin of the American Physical Society
Annual Meeting of the APS Four Corners Section
Volume 60, Number 11
Friday–Saturday, October 16–17, 2015; Tempe, Arizona
Session B2: Astrophysics I: Fundamental Science |
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Chair: Damien Easson, Arizona State University Room: MU230 |
Friday, October 16, 2015 10:50AM - 11:02AM |
B2.00001: Scalable relativistic fluid dynamics for heterogeneous computing Forrest Glines, Matthew Anderson, David Neilsen A shift is underway in high performance computing towards new computer architectures that combine traditional CPUs with floating point accelerators, such as GPUs. We have developed a new relativistic fluid code that runs on NVIDIA GPUs using the piecewise-parabolic method, a standard method for compressible fluids found in astrophysics and engineering applications. We present a test study with relativistic magnetohydrodynamics showing that our code scales well in scaling tests with hundreds of nodes. [Preview Abstract] |
Friday, October 16, 2015 11:02AM - 11:14AM |
B2.00002: Using Machine Learning to Discover Theories of Everything Conrad W. Rosenbrock, Gus L. W. Hart The great difficulty with a ``theory of everything'' is that it needs to model complex, non-linear relationships between variables. I will present the nuts and bolts of a machine learning framework that uses similarity kernels to transform the non-linear problem into a tractable, linear one. Inasmuch as the method relies crucially on mathematical representations, we investigate it by example: predicting the properties of all possible materials. The key idea is to construct a continuous, smooth, differentiable representation with appropriate invariances under available symmetries. [Preview Abstract] |
Friday, October 16, 2015 11:14AM - 11:26AM |
B2.00003: Post-Newtonian Tests of Gravity with Lunar Laser Ranging Daniel Havert The precision of lunar laser ranging makes it useful in studying post-Newtonian gravity. By introducing constant coefficients from the Standard Model Extension that account for Lorentz symmetry violations in the Lagrangian for gravity, perturbations appear in the acceleration components of the moon. The lunar distance as a function of time is calculated from these perturbations and grouped into the terms according to frequencies. These terms will then be fit to lunar laser ranging data to put restrictions of the SME coefficients. [Preview Abstract] |
Friday, October 16, 2015 11:26AM - 11:50AM |
B2.00004: Tests of fundamental physics in space Invited Speaker: Quentin Bailey Precision measurements in the solar system and beyond offer a promising testing ground for fundamental physics. In this talk, I present a review of recent work on precision tests of spacetime symmetries using planetary ephemeris, pulsar timing, and high-energy cosmic rays. The measurements are analyzed using an effective field theory framework that offers a systematic description of generic violations of spacetime symmetries, in particular Lorentz and CPT symmetry. [Preview Abstract] |
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