Bulletin of the American Physical Society
Spring 2021 Meeting of the APS Ohio-Region Section
Volume 66, Number 3
Friday–Saturday, April 9–10, 2021; Virtual Meeting Hosted by John Carroll University, Cleveland Heights, OH; Time Zone: Eastern Daylight Time, USA
Session B04: Contributed Talks IV |
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Chair: Laura DeGroot, College of Wooster |
Saturday, April 10, 2021 8:00AM - 8:12AM |
B04.00001: The density of a black hole is a constant Han yong Quan the volume formula V$=$(4/3)$\pi $R$^{\mathrm{3}}$, the density of the stars $\rho =$M/V. From the density formula, we can see: the density and radius of the stars in the process of star change According to the law of conservation of angular momentum, MVR$=$MCRS, so V$^{\mathrm{3}}$R$^{\mathrm{3}}=$C$^{\mathrm{3}}$R$^{\mathrm{3}}_{\mathrm{S}}$. Conclusion: The radius cube is inversely proportional to the cube of the spin speed, and the density is inversely proportional to the cube of the radius. Then the density must be proportional to the cube of the velocity. Proportional: $\rho =$KV$^{\mathrm{3}}$. The speed of the black hole's rotation is the speed of light, so the density of the black hole $\rho =$KC$^{\mathrm{3}}$ where K is the constant of proportionality and C is the speed of light, so the density of the black hole is a constant. The density of the sun is: 1.408\texttimes 10\textthreesuperior kg/m3, and the speed of the sun's rotation is 2\texttimes 10$^{\mathrm{3}}$ m/s, substitute $\rho =$KV$^{\mathrm{3}}$ to calculate K$=$1.76\texttimes 10$^{\mathrm{-7}}$, substitute $\rho =$KC$^{\mathrm{3}}==$1.76\texttimes 10$^{\mathrm{-7}}$\texttimes (3\texttimes 10$^{\mathrm{8}})$3$=$4.752\texttimes 10$^{\mathrm{18}}$(kg/m$^{\mathrm{3}})$ [Preview Abstract] |
Saturday, April 10, 2021 8:12AM - 8:24AM |
B04.00002: Post-merger gravitational wave searches using the Cross-Correlation Algorithm Tanazza Khanam, Alessandra Corsi, Rob Coyne, Eric Sowell After the multi-messenger detection of the binary neutron star merger GW170817, associated with gamma-ray burst (GRB) 170817a, one big open question left is the nature of the compact remnant which acts as a central engine for the GRB. In the context of cosmological GRBs, it has been suggested that X-ray afterglows showing light-curve plateaus at timescales of order 10$^{\mathrm{2\thinspace }}$-10$^{\mathrm{4\thinspace }}$s since the GRB/merger could harbor a long-lived central engine, such as a long-lived highly magnetized NS (magnetar). Newly born magnetars have also been proposed as potential gravitational wave (GW) sources. Motivated by these considerations, we present first results from a new GW data analysis method (the Cross Correlation Algorithm-CoCoA) targeting long-lived GWs from magnetars formed in binary NS mergers associated with GRBs. We show how our search method improves substantially on previously published results for post-merger GW searches in GW170817, but requires a more restrictive hypothesis on the GW signal properties. We conclude by discussing the prospects for these types of searches in future runs of the LIGO detectors. [Preview Abstract] |
Saturday, April 10, 2021 8:24AM - 8:36AM |
B04.00003: Carbon isotopes viewed from ab initio structure and elastic scattering Gabriela Popa, Charlotte Elster, Matthew Burrows, Robert Baker, Pieter Maris, Stephen Weppner, Kristina Launey h $-abstract-$\backslash $pard We study elastic proton scattering off the Carbon isotopes with 4, 6, 8, and 10 neutrons within the framework of an ab initio implementation of the leading order term of the spectator expansion of multiple scattering approach at 100 MeV projectile energy.$\backslash $pardAs the number of neutrons increases, the carbon isotopes allow us to study open and closed shell nuclei in the neutron space. The nonlocal one-body densities and nucleon-nucleon (NN) amplitudes needed to construct the effective nucleon-nucleus (NA) interaction are based on the NNLO\textunderscore opt chiral NN potential. The one-body densities employed are obtained from the no-core shell model (NCSM).study the spin structure of the ground state of the different carbon isotopes as well as its influence on elastic scattering observables (cross sections and spin observables) from those even-even isotopes.$\backslash $pard$\backslash $pard-/abstract-$\backslash $\tex [Preview Abstract] |
Saturday, April 10, 2021 8:36AM - 8:48AM |
B04.00004: Transient CFD Simulations of Dye Diffusions in A Square Tube Flow Mark Johnson, Zifeng Yang In using medical imaging techniques such as angiography, contrast agents are injected into the blood flow to provide contrast in the resulting images. Using these images to calculate flow field quantities is possible with the optical flow method (OFM). This method has high spatial resolution as it calculates velocity vectors at each pixel in the image. However, the accuracy of the velocity field result is questionable, especially for complex 3D flow configurations. The cause of these inaccurate measurements roots in direct projection of a 3D flow on to a 2D image. To atone for these 3D-2D projection errors, the known 3D flow field for 2D projections is required by using Computational Fluid Dynamic (CFD) software to simulate the transient flow in both the laminar and turbulent regime. These simulations are representative of a parallel experimental setup which will be used for comparisons. This is the first phase in which these simulations are used to generate 2D images in comparison with experimental results. Later, the generated 2D images and the 2D velocity fields coupled with the simulated 3D flow will be used to train a machine learning program, which will make it capable of using 2D angiography images to reveal 3D blood flow fields within the human vascular system. [Preview Abstract] |
Saturday, April 10, 2021 8:48AM - 9:00AM |
B04.00005: Contour integrals and period formulae of the tautochrone Matthew Commons, Michael Crescimanno In 1673, C. Huygens determined that a pendulum whose string is restricted to wind around a cycloid curve has a peculiar property: its period is ``tautochronic'', that is, independent of its amplitude. Though initially of interest for precision time, we discuss this curious result from the perspective of symmetries and topology of the period integral. We demonstrate this phenomenon in measurements by J. George using a 3d printed cycloidic guide. [Preview Abstract] |
Saturday, April 10, 2021 9:00AM - 9:12AM |
B04.00006: (Re)constructing the Spectrum of QCD$_{2A}$ with Asymptotic Eigenstates Uwe Trittmann We previously presented a method to construct the asymptotic eigenstates of two-dimensional adjoint QCD. Here, we present a streamlined algorithm capable of generating the ground states in all parton sectors. This enables us to explain known properties of the spectrum of QCD$_{2A}$ with ease. First results in applying the method within a basis-function approach to the full theory are discussed. [Preview Abstract] |
Saturday, April 10, 2021 9:12AM - 9:24AM |
B04.00007: A Math Experiment Comparing Gravity and Mass at Planck Length Matt Dray The math experiment was to see what the gravitational field of a singular mass would be like in an empty universe. It seemed \textonehalf of the force of 2 exact masses, separated by exactly 1 Planck length would provide a base to start and multiple calculations would be repeated for different masses. I expected that the value of gravitational force potential created by a mass would be consistently ratioed with the mass. Results of the calculations showed that the amount of gravity generated by each mass (single gravitational force / mass) did not show a consistent ratio, instead it showed that as mass increased, this ratio also increased. Furthermore, the ratio of the difference between the ratios of their gravitational force/mass and the difference between the 2 mass values gives a consistent value of 1.2774x10\textasciicircum 59 no matter what 2 masses are compared. This value x 2, which is 2.5549x10\textasciicircum 59, could possibly be a value of some significance. [Preview Abstract] |
Saturday, April 10, 2021 9:24AM - 9:36AM |
B04.00008: A new theoretic framework mathematically derived from the principle of constant light speed QIAN CHEN The well-established principle of the constancy of the velocity of light can be mathematically represented with the general equation O(t$_{\mathrm{o}})$-S(ts)$=$c(t$_{\mathrm{o}}$-ts). Based solely on this equation without including any other assumptions, a comprehensive set of ground-breaking results was derived solely through strict mathematics, covering: the Light velocity; Sagnac effect; Stellar aberration; Time dilation; Doppler effect; Lorentz force law; Maxwell's wave equations; Momentum to acceleration ratio; Mass-Energy relationship; Mass of moving particle. This set of results is named ``Asymmetry Theory'', which is comprehensive, self-consistent, and in harmony with all existing experiments. It provides a straightforward and mathematical explanation of key physical phenomenons without any paradox, including the Sagnac effect, one-way light speed, M-M experiment, observed time dilation, ``twin paradox'', Doppler effect, cosmological redshift, and particle acceleration. Furthermore, Maxwell's equations provide the theoretic base and proof for Asymmetry Theory. Two experiment designs based on the predictions of Asymmetry theory are proposed for further conclusive confirmation. [Preview Abstract] |
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