Bulletin of the American Physical Society
New England Section Fall 2022 Meeting
Volume 67, Number 13
Friday–Saturday, October 14–15, 2022; University of New Hampshire, Durham, NH
Session K04: General Physics |
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Chair: Michael Lathwood, University of New Hampshire Room: University of New Hampshire in Durham DeMeritt Hall 238 |
Saturday, October 15, 2022 1:00PM - 1:12PM |
K04.00001: Binary Black Hole Mergers: Comparison of Numerical Relativity and Particle Perturbation Methods Richard H Price Since the early 1970s much has been learned about black hole physics |
Saturday, October 15, 2022 1:12PM - 1:24PM |
K04.00002: Study of Kirkwood Gaps in a Planar Restricted Three-Body Formulation David W W Kraft It was discovered by Kirkwood [1] that the distribution of asteroid orbital frequencies contains gaps for orbits whose period is commensurate with that of Jupiter and a resonance phenomenon owing to the presence of that body has been invoked as a mechanism to account for the absence of asteroids in these gaps [2]. In an extension of previous work [3], we solve the coupled differential equations of motion of Jupiter and an asteroid test body under assumptions of a stationary Sun, circular orbits for Jupiter and a test body of negligible mass placed initially in a forbidden orbit. Deviations from the forbidden orbits were studied and in one case a periodic return to the starting orbit was observed. This periodicity suggests confirmation of the presence of a resonance mechanism. |
Saturday, October 15, 2022 1:24PM - 1:36PM |
K04.00003: The First Law of Thermodynamics in AdS5 in the Presence of Conformal Anomalies Hassan ElSayed In this talk I will present the results that we recently reported in arXiv:2209.09031 (cur- rently under review by JHEP). In this research we proposed a solution to a long-standing problem with the compatibility of the counterterms subtraction method with the first law and generalized Smarr's formula in extended phase-space. We used the counterterms sub- traction method to calculate various thermodynamical quantities for charged rotating black holes in five-dimensional minimal gauged supergravity. Specifically, we analyzed certain issues related to the first law and Smarr's relation in the presence of a conformal anomaly. Among the bulk quantities calculated are the on-shell action, total mass, and angular mo- menta of the solution. All these quantities are consistent with previous calculations made using other methods. For the boundary theory, we calculate the renormalized stress tensor, conformal anomaly, and Casimir energy. Using the Papadimitriou-Skenderis analysis [2], we showed that the mass calculated via the counterterms method satisfies the first law of black hole thermodynamics. To discuss extended thermodynamics, we extended the definition of the thermodynamic volume to cases with conformal anomalies using a procedure similar to that of Papadimitriou-Skenderis. We showed that this volume correctly accounts for extra terms due to boundary metric variation. This shows that the mass and volume calculated using counterterms satisfy Smarr's relation as well as the first law. |
Saturday, October 15, 2022 1:36PM - 1:48PM |
K04.00004: The large amplitude simple pendulum and Fourier series; an analysis for undergraduates Brennen J Black, Vetri Vel A pedagogical and theoretical study of the behavior of a simple pendulum is presented. Fourier series and perturbation analysis at levels appropriate for undergraduate physics students are used to accurately derive the motion of a pendulum. Instead of using the elliptic integral of the first kind, appropriate higher order terms of the Taylor-expanded differential equation are considered, leading to increasingly accurate corrections to the period. It is found that the relation between the order parameter and the initial conditions is not fixed, allowing many solutions to the motion in terms of the order parameter but a unique solution in terms of the initial conditions. The error in the presented corrections is compared to published approximations. |
Saturday, October 15, 2022 1:48PM - 2:00PM |
K04.00005: Electrically Controlled Spectral Properties of Polymer-Dispersed Liquid Crystals Tailored to Privacy Windows Applications Lucas C Roosli, Sergio Guevara, Colin Caruth, Adrian Parnell, Yuriy Garbovskiy Abstract: Polymer-Dispersed Liquid Crystals (PDLC) respond to electric fields, which allows for switching between opaque and transparent states of the PDLC film. As a rule, the reported electro-optical properties of polymer-dispersed liquid crystals were obtained using a monochromatic light source (typically, a laser). From perspectives of privacy windows applications, it is important to study the dependence of basic parameters (contrast ratio, transmittance, and the switching curves) on the wavelength of light.. This paper reports electrically controlled spectral properties of PDLC films. The experimental results obtained can be used to improve the performance of privacy windows made of polymer-dispersed liquid crystals. |
Saturday, October 15, 2022 2:00PM - 2:12PM |
K04.00006: Studying the Polarization of Protoplanetary Nebulae using Newly Developed Polarization Sensitive Imaging Sensors Nina Christenson, Dipankar Maitra, Celeste Berenbaum, Adrian Grimm The goal of this project was to test a new camera equipped with the Sony IMX250 polarization sensor in order to image astronomical objects. When searching for candidates, we looked for objects that were optically bright and exhibited a high degree of linear polarization. Before imaging, we carried out experiments to determine the linearity of the sensor and the polarization orientation of the pixels, as well as to quantify the offset and gain scales. After these initial experiments, the camera was mounted to the Meade LX600 12-inch telescope and used to image the Egg Nebula (CRL 2688) and the Footprint Nebula (M1-92). Initial results from these imaging sessions will be presented. A strongly polarized background that is present in the Footprint Nebula images (and not in the Egg Nebula images) will be explored. Future steps for the project include investigating the impact of environmental factors on astronomical imaging, as well as extending our candidate pool to include optically bright, linearly polarized quasars. |
Saturday, October 15, 2022 2:12PM - 2:24PM |
K04.00007: The Quantum Certainty Knowledge Theory: An Indeterminate and Determinate Theory of Quantum Interaction Donald R LaCoy The Quantum Certainty Knowledge theory presents a measurement solution focused on quantum interaction for an analyzer and an Alice and Bob experiment combining the determinacy of the Many Worlds Interpretation (MWI) with the indeterminacy of quantum entanglement/ superposition (QES). It focuses on Quantum Interaction States (QISs) which define how the quantum collapses into outcomes. The prevailing theories are either determinate or indeterminate and have focused on the observable classical outcomes, likely because that is all a classical physicist can observe. The Quantum Certainty Knowledge theory combines determinacy and indeterminacy into one solution while focusing on the QISs whose information collapses into the classical outcomes. Determinate, indeterminate, and null QISs exist for an analyzer and an Alice and Bob experiment. This thought experiment explains what is being measured and how the QIS information collapses into the historical outcomes. The Quantum Certainty Knowledge Theory explains the observations seen in the MWI, QES, and most quantum conundrums. |
Saturday, October 15, 2022 2:24PM - 2:36PM |
K04.00008: A Unifying Theory for Quantum Physics Jeffrey H Boyd The quantum world is allegedly strange. But is it? What if there’s a simple mathematical explanation, and a simple solution? The success of quantum mechanics (QM) arises from the accuracy of its probability predictions, which are obtained by squaring amplitudes (the Born rule). Suppose for a moment that nature uses the negative of QM’s equations. When squared they would yield the same probabilities, confirmed by the same experiments and technological triumphs. If that were true, if nature uses the negative of QM’s equations, then the quantum world would become transparent, easy to understand. No more Schrodinger’s-cat. No quantum-eraser. No backwards-in-time cause-and-effect. No paradoxes nor enigmas. But, what’s a negative quantum equation? It could mean that particles follow zero-energy waves backwards, instead of forwards. That’s still an eccentric idea. Overall, it’s a bargain. We could swap one odd idea for another, because wave-particle duality is odd. We are accustomed to wave-particle duality. But we’ll show that experiments support the other arrangement: quantum particles follow zero-energy waves backwards. How could that possibly be true? We have experimental evidence, and new mathematics. |
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