Bulletin of the American Physical Society
2019 Annual Meeting of the APS Four Corners Section
Volume 64, Number 16
Friday–Saturday, October 11–12, 2019; Prescott, Arizona
Session L05: General Physics and Foundations of Physics |
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Chair: Jean-Francois Van Huele, BYU Room: AC1 107 |
Saturday, October 12, 2019 11:00AM - 11:12AM |
L05.00001: Angles-Only EKF Navigation for Hyperbolic Flybys Ian Matheson Recent concepts for interstellar travel, notably the Breakthrough Starshot initiative, attempt to define a minimum feasible probe to return in situ data about a nearby star within the career lifetime of a single researcher with minimal investment in ground-based or space-based infrastructure. These concepts generally propose launching gram-scale probes, consisting of little more than an optical camera and a microprocessor, to speeds on the order of 0.1$c$ on an enormous laser. For lack of onboard computational resources, an extremely simple navigation technique is required to autonomously estimate position and velocity; most authors suggest some form of Kalman filter. This study shows that a simple extended Kalman filter processing angles-only measurements is capable of consistently estimating position and velocity for a Starshot-style probe when provided with highly accurate initial estimates and small initial uncertainty at speeds characteristic of current space probes (0.00002$c)$, as well as the gravity of the target star, but does not investigate filter performance at proposed Starshot speeds. [Preview Abstract] |
Saturday, October 12, 2019 11:12AM - 11:24AM |
L05.00002: Bohmian Trajectories for Quantum Information Matthew Lawyer, Jean-Francois Van Huele Quantum computing relies on qubits and superposition.Bohmian mechanics relies on continuously defined trajectories, rejecting the idea of superposition. Can quantum computers be used to distinguish between Bohmian mechanics and canonicalquantum mechanics? To help answer this question, I study the trajectories of simple harmonic oscillators. I numerically calculate trajectories using Bohm's quantum potential and provide illustrations. [Preview Abstract] |
Saturday, October 12, 2019 11:24AM - 11:36AM |
L05.00003: Accelerating Materials Discovery through Bezier Interpolation of the Electronic Band Structure Nathan Foulk, Jeremy Jorgensen, Gus Hart To discover the materials that will shape the world of tomorrow, we need to make the materials calculations of today faster. Integrating the electronic band structure is one of the most important parts of these materials calculations. Unfortunately, it is also the slowest part of these materials calculations. We show that interpolating the electronic band structure using Bezier surfaces speeds up this band structure integral, without sacrificing accuracy. We also explore further speedup by using an adaptive mesh refinement in those integration regions which contain the Fermi surface. [Preview Abstract] |
Saturday, October 12, 2019 11:36AM - 11:48AM |
L05.00004: Cat states, Decoherence, and Rotational Smearing in Optomechanical systems Ty Beus Optomechanical systems~consist of a laser cavity coupled with a moving~microscopic~mirror. Such a system creates cat states which approximate qubits.~Another feature of this system is decoherence effects. Decoherence is~essentially a loss of information when coupled with another system, in this case, loss of rotational information, shown in a phase diagram. Here, we explore the development of these cat states, as well as the effects of decoherence which lead to a rotational smearing effect.~ [Preview Abstract] |
Saturday, October 12, 2019 11:48AM - 12:00PM |
L05.00005: Physics of Dark Energy Charles Sven The most important thing is what Richard Feynman told us: ``All things are made of atoms.'' We have had our observational senses enhanced by the invention of microscopes, telescopes and everything in between allowing us to seek answers to the deepest questions of the day including how was our Universe created and what is the Physics of Dark Energy? Today, unsupported by physics, is the current poor cosmological concept that our Universe's atoms were created from a `singleton' popping out of `nothing,' and consequently not well received. That indicates that we need to study these atoms for a better explanation. In that light, here assembled is a number of pertinent facts when properly arranged, allows us to understand atoms and how the `physics' of dark energy was employed in the Creation of our Universe; before, during, and after the Big Bang. Based on all the evidence provided herein we find that the creation of our Universe was constructed out of chaotic Dark Energy and that the vast, powerful, timeless, and chaotic Dark Energy existed prior to the Big Bang and continues to exist based on all the dark energy requirements as described of stars shinning in all the galaxies in our Universe. [Preview Abstract] |
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