Bulletin of the American Physical Society
2021 Virtual Conference for Undergraduate Women in Physics
Friday–Sunday, January 22–24, 2021; Virtual
Session U21: Theoretical and OtherInteractive Live
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Chair: Ariel Baksh, Cornell University |
Sunday, January 24, 2021 12:00PM - 12:10PM |
U21.00001: Binomial coefficients and Arithmetic Progression in an Alternating Series with its interpretation in Vector Space Nitika Sachdeva A series is defined using terms of arithmetic sequence taken along with binomial coefficients nCr. By deriving it in all the subsequent sections of Pascal's hexagon, the series is extended for nCr where n,r belong to R.Further, it is analysed in a vector space and is found to be a subspace of it. The series is studied as a scalar product of three-dimensional vectors where some of the findings are generalized for n-dimensions. [Preview Abstract] |
Sunday, January 24, 2021 12:10PM - 12:20PM |
U21.00002: Measuring Impacts of Glitch Removal on Gravitational Wave Parameter Estimation Lilah Mercadante, Jonah Kanner, Alan Weinstein No scientific endeavor ever runs flawlessly. There are always malfunctions and interference that cause the data to be less than perfect. In the case of gravitational wave data, one of the defects often found in the signals are noise transients, called glitches. These glitches are often difficult to model due to their non-Gaussian nature. It is not currently routine practice to remove them, although sometimes glitch subtraction must be done when the glitch strongly interferes with the signal. Each glitch is unique. The process of glitch subtraction is time consuming and has not yet been tested and documented in a systematic way. We hope to add to the documentation on the effects of glitch removal on parameter estimation by running parameter estimation on a data set of simulated signals with glitches injected at varying distances from the signal. We will then remove the glitch from the data and run parameter estimation on the clean waveform. This will allow us to study how the distance between the glitch and the signal plays a role in the accuracy of the parameter estimation. While we discovered that the presence of the glitch has a recognizable effect on recovering the parameters, we have yet to draw conclusions on how the distance of the glitch affects these results. [Preview Abstract] |
Sunday, January 24, 2021 12:20PM - 12:30PM |
U21.00003: Rolling with Ruherford Simulation Aaliyah Harris QuarkNet is a collaboration led by Fermilab and the University of Notre Dame that provides opportunities for high school teachers and students to develop valuable skills by engaging in high energy physics. The project discussed in this poster enhances the Rolling with Rutherford simulation, originally developed by a QuarkNet high school physics teacher, using the GlowScript IDE and VPython. GlowScript is a web-based environment that is efficient for creating 3D animations and simulations, especially in the field of physics. ~The simulation, which originally demonstrated scattering through hard sphere scattering of a probe particles off a target containing a fixed number of particles of fixed size, is being expanded to change the size of the probe particle and the number of probe and target particles and to look at the scattering distribution. Users will also be able to change the interaction to an electric force interaction between charged particles to actually simulate Rutherford scattering. ~The simulation will include various buttons and sliders that will give students the ability to control and change different aspects of the simulation, which will make it efficient for students to learn how charged particles interact.~ [Preview Abstract] |
Sunday, January 24, 2021 12:30PM - 12:40PM |
U21.00004: Tetris artificial spin ice Aikaterini Kargioti, Hilal Saglam, Ayhan Duzgun, Xiaoyu Zhang, Nicholas S. Bingham, Yuyang Lao, Joseph Sklenar, Ian Gilbert, Christiano Nisoli, Peter Schiffer Artificial spin ice systems are composed of arrays of interacting nanomagnets, and they were originally designed to mimic the naturally occurring frustration in real spin ice materials. The original square ice geometry [1] can be altered to give rise to an array of vertex-frustrated geometries, such as Tetris [2] and Shakti [3], that allowed the study of new interesting physics phenomena. The Tetris ice structure is composed of alternating bands of staircase and backbone nanomagnets. We conducted PEEM-XMCD experiments at varying temperatures and evaluated the Tetris ice kinetics by analyzing the resulting flipping rates and vertex fractions. We showed, in accordance with previously reported data [2], that the backbone magnetic moments are more stable than the staircases. 1. Wang et al., Nature \underline {439}, 303 (2006) 2. Gilbert et al., Nat. Phys.~\underline {12}, 162 (2016) 3. Lao et al., Nat. Phys. 14, \underline {723} (2018) [Preview Abstract] |
Sunday, January 24, 2021 12:40PM - 12:50PM |
U21.00005: On equations of motion, invariance of the action integral and symmetry transformations \\ \\ Ysla Adans, Caio Ressureicao, Jose David Mangueira Viana \\ \\As it is well known, group theory has a wide application in Classical Physics and Quantum Theory, both in relativistic and non-relativistic formulation. On this subject, one of the themes of interest is the formulation of methods capable of determining the symmetry group of a given physical system. In this work, we aim to show the application of two methods: one explores the system's equation of motion and the other uses the invariance of the system's action. In the first, starting from the equation of motion and general expressions of the generators, the Lie algebra of the symmetry group is determined; in the second starting from the action integral, conditions are obtained that characterize the symmetry group that leaves the Lagrangian invariant, the invariant action and the invariant motion equation. We apply these methods to the simple harmonic oscillator and to the damped harmonic oscillator. In both cases we obtain as a result a group with eight parameters that preserves the equation of motion and a subgroup with five parameters that preserves the action named in the literature by the group of Noether symmetries. Constants of the motion for each system are also determined and explored. [Preview Abstract] |
Sunday, January 24, 2021 12:50PM - 1:00PM |
U21.00006: Hamiltonian formulation of higher order Chern-Simons field theory. Diana Castro, Alberto Escalante We use a model that involves the higher (third) derivative of the Chern-Simons (CS) abelian topological term in D = 2 + 1 dimensions. Then we discuss the Hamiltonian structure of such higher derivative models following the Ostrogradsky formalism for higher order Lagrangian for the Maxwell-Chern-Simons field theory we also illustrated the problem in quantising these higer derivated models. [Preview Abstract] |
Sunday, January 24, 2021 1:00PM - 1:10PM |
U21.00007: Investigating The Use Of ANSYS HFSS To Simulate An SRF Cavity Coupled To An Infinite Coaxial Cable Gayathrini Premawardhana, Thomas Oseroff, Matthias Liepe The Cornell superconducting radio frequency (SRF) group was investigating a way to extend the use of ANSYS HFSS (ANSYS Electronics Desktop Version 2019.2.0), a finite element method solver for electromagnetic simulations, to simulate an SRF cavity coupled to a coaxial cable of infinite length. Since we cannot create a model of an infinite coaxial cable, the port end of the model should not be restricted to either one of perfect electric or magnetic boundary conditions. The inability of HFSS to directly solve for a combination of these boundary conditions, and the absence of an alternative boundary condition that met our requirements, made it necessary to employ another method to obtain accurate solutions. We focused on implementing an algorithm from a paper by Gulliford et al. [1] which aimed to give the final solution by combining two separate solutions, each obtained from HFSS. An external Mathematica program was written to conduct this combination. With this implementation, we were able to obtain an external quality factor for the setup that remained constant with changing the length of the model's coaxial cable, a result which cannot be obtained when HFSS is conventionally used with only its built-in functionality. [1] https://doi.org/10.1103/PhysRevSTAB.14.032002 [Preview Abstract] |
Sunday, January 24, 2021 1:10PM - 1:20PM |
U21.00008: Reduced Hamiltonian Simulation for Near-term Quantum Computers Diana Chamaki, Mekena Metcalf, Nathan Wiebe, Ojas Parekh, Wibe de Jong Previous methods for simulating fermionic Hamiltonians on quantum computers are based on a one-to-one mapping between fermions and qubits. The number of qubits required to simulate the Hamiltonian using such methods can be reduced by exploiting symmetries. However, the Hilbert space using these methods still includes unnecessary states and can be even further reduced. We use combinatorial techniques to map a Hamiltonian onto states rather than qubits, and then we use this technique in algorithms for near-term quantum devices. Specifically, we use our mapping to solve for the ground state energy of various molecules using the Variational Quantum Eignesolver (VQE) and were successfully able to reduced the number of qubits required to do so by a significant amount. [Preview Abstract] |
Sunday, January 24, 2021 1:20PM - 1:30PM |
U21.00009: Differential manifolds applied to theoretical mechanics Karla De Los Santos, Mercedes Velázquez The study and development in areas like topology and differential geometry brought a practical physics approach based on differentiable manifolds; with this formalism, different physics areas were reformulated, such as theoretical mechanics, thermodynamics, general relativity, and others. The present work is a review of the use of differential manifolds in the study of theoretical mechanics. [Preview Abstract] |
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