Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session WW03: V: General Physics III |
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Chair: Alexey Grinin, Northwestern University, Center for Fundamental Physics Room: Virtual Room 3 |
Wednesday, April 26, 2023 8:00AM - 8:12AM |
WW03.00001: Numerical Methods and Analysis for Computing Forward and Inverse Laplace Transform For discrete and continuous signals Yueyang Shen, Yupeng Zhang, Ivo D Dinov Specialized data maps transforming (probabilistic) state representations mapping the original signal representation into a more manipulatable state space capitalizes on contemporary computational advances and relates to well-known application scenarios, such as kernel machines, MDP transition dynamics modeling and policy optimization, and generative modeling. In this work we focus on the classic example of Laplace transform, which maps the subspace of differential equations to the space of algebraic equations, where the differential equation solution can be obtained by inverting the algebraic equation solution. Effective integral transformations enable simplification of mathematical modeling and computational inference. The Laplace transform (LT) with its inverse (ILT) represents a family of integral transforms that have direct applications in contemporary data science, statistical inference, and probabilistic modeling. However, practical computational challenges inhibit their utilization on complex or implicit functions, noisy observations, and incomplete data. |
Wednesday, April 26, 2023 8:12AM - 8:24AM |
WW03.00002: Bayesian Beam Optics Measurement and Correction Nikita Kuklev Particle accelerators require extensive optics measurement and correction. Due to the complexity of a full analytic treatment, standard methods rely on multiple iterations of simplified linear algorithms under optimistic assumptions as to the noise distributions and systematic errors. We explore a reformulation of beam optics measurements as a Bayesian inference problem. This provides several advantages - posterior distributions of the fitted parameters, faster optics correction convergence, better interpretability, and the ability to take into account various nonlinear elements and effects. Algorithm is implemented by converting beamline elements into PyTorch framework so as to make use of efficient automatic differentiation, and Pyro probabilistic programming language is then used for inference. We demonstrate correct results of our algorithm on both simulated and experimental data measurements, as compared with LOCO algorithm. We also showcase advantages of our method in the presence of non-Gaussian noise and non-standard magnetic elements. |
Wednesday, April 26, 2023 8:24AM - 8:36AM |
WW03.00003: Straightening of the 2D black phosphorus using electron beam irradiation MANPREET KAUR, Kiran Shankar Hazra Large area 2D nanomaterials are susceptible to formation of surface corrugations during synthesis, transfer and handling of samples and their physicochemical properties are extraordinarily affected by the formation of surface corrugations. Even though several strategies have been devised by researchers for smoothing the 2D flakes, the issue is far from resolved. Here, we report the straightening of Black Phosphorus (BP) flakes using electron beam irradiation that enables the removal of ripples, disclination and line defects from lattice. The crystallinity and buckling of flake is controlled by varying the electron fluence rate and irradiation time in a high resolution transmission electron microscopy set-up. Experimental results show that the optimal electron beam exposure (20 to 30 minutes of exposure at fluence rate = 1.02 ×1029 m-2 s-1) de-stresses/ relaxes the lattice and the maximum ordering of lattice planes is achieved; beyond which, the stress in lattice rises again and lattice planes start buckling. Thus, straightening of the 2D flakes using electron beam ensures removal of surface corrugations with nanoscale precision and allows for real-time monitoring of the process. |
Wednesday, April 26, 2023 8:36AM - 8:48AM |
WW03.00004: Contrary to Mermin, Bohr Did Acknowledge a Significant Quantum Measurement Problem - The Importance of William James, The Early American Psychologist, To Bohr, Mermin, And Carroll’s Epistemic Option For Quantum Measurement Douglas M Snyder James’s complementarity works well with the proofs at the heart of null and positive measurements in quantum mechanics. It is important for the physics community to know that complementarity originated in psychology in 1890, in the work of James, an early American psychologist, to know his finding that “the total possible consciousness may be split into parts which coexist but mutually ignore each other, and share the objects of knowledge between them.” The human observer is central in James’s complementarity. Consciousness and knowledge are essential. It appears that James’s complementarity is likely the correct conceptual model for quantum measurement. Bohr borrowed James’s complementarity and adapted it for physics by introducing an unavoidable physical interaction between a physical measuring instrument and the physical system measured. This physical interaction has an aspect that cannot be controlled. This allowed Bohr to apply the uncertainty principle. Bohr’s complementarity for physics is unwarranted. His view does not work for null measurements which are dependent on a logical proof. For positive measurements, once there is a logical proof that a certain measurement outcome will occur, the wave component associated with other possible measurement outcome vanishes. No interference is then possible. Perhaps through collaboration between physics and psychology further progress can be made in developing a self-consistent view of quantum measurement supported by empirical evidence. |
Wednesday, April 26, 2023 8:48AM - 9:00AM |
WW03.00005: CMS W2D2 Rahmat Rahmat World Wide Data Day (W2D2) is a 24-hour span, midnight-to-midnight UTC, in which students from around the world can analyze data from CMS and share results via an ongoing, 24 hour videoconference with physicist moderators taking shifts in locations around the world. Students had fun learning about high energy physics. |
Wednesday, April 26, 2023 9:00AM - 9:12AM |
WW03.00006: Beyond the 120 years between Paul Villard Gamma Rays and US LLNL Fusion Ignition breakthroughs Claude Massot Fermi did build his 1942 Pile in 4 years. But, today's Physics is unable to provide, in a foreseeable future, the fusion energy, vital for the planet, because it is stifled by its dogmatic theoretical drift toward a Standard Model and by its hypertrophied House of Cards of interpretations. Fundamental Research is aiming at giga projects, tera-watt gulpers, not producers. (Nobel, Philip Anderson's fight). As an engineer, entering the fusion race, I path an alternate, deterministic, non relativist, mechanical, lighter Physics access to the huge reservoir of energy locked inside the nuclei, by squarely disrupting the century old established Nuclear conceptual basis. My flat Ring, electron, proton Theory rejects most present Standard assumptions, especially: Lorentz, Planck, Wien, Stefan-Boltzmann radiation equations and the mistaken UV Catastrophe, (refuted by Beta/Gamma rays), the constancy of the electric charge, the point-like/wavy nature of the electron, the reality of quarks and gluons, the neutron and neutrino as elementary particles, the proton/neutron nucleus, the published measured and computed values of atomic masses, mass defects, binding energies...My neutron-less nucleus is a cluster of protons with orbiting, MeV, GeV... (Delta Rays?), nuclear electrons. |
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