Bulletin of the American Physical Society
Joint Spring 2012 Meeting of the Texas Sections of the APS and AAPT and Zone 13 of the SPS
Volume 57, Number 2
Thursday–Saturday, March 22–24, 2012; San Angelo, Texas
Session H1: Contributed Oral Presentations: APS 5 |
Hide Abstracts |
Chair: Michael Daugherity, Abiliene Christian University Room: Houston Harte University Center UC 203 |
Saturday, March 24, 2012 10:30AM - 10:42AM |
H1.00001: Behavior of Viscous Potential during Purely Northward Interplanetary Magnetic Field Shree Bhattarai, Ramon Lopez The solar wind, on passing around the Earth's magnetosphere, drags along with it the plasma inside the magnetosphere due to the formation of Kelvin-Helmholtz waves. This dragging of the magnetospheric plasma close to the magnetopause along the flanks is followed by a return flow inside the magnetosphere, thus creating a circulation pattern. This viscous cycle gets mapped down to the ionosphere, thus imposing an electric field on Earth's ionosphere. The value of the electric potential generated due to the electric field produced by the viscous cycle is called the viscous potential. It was assumed that the viscous potential was independent of IMF orientation but, in this paper, we show that the viscous potential is a function of IMF Bz for northward IMF. [Preview Abstract] |
Saturday, March 24, 2012 10:42AM - 10:54AM |
H1.00002: Small Telescope Extrasolar Transit Searches (STExTS) Data Analysis Andrew Bechter, Richard Olenick, Arthur Sweeney, Blaise Bufrain, Eric Bechter In 2011 the STExTs project surveyed the open cluster Dolidze-Dzimselshvili 9 in Hercules for 37 nights using a f/2.8 152 mm astrograph during which time approximately 11,000 images were obtained. We will discuss the star extraction algorithm, systematic error removal algorithm, and analyses used in processing the lightcurves for approximately 1900 stars. We will present our findings on new variable star candidates as well as new characteristics of existing variable stars. [Preview Abstract] |
Saturday, March 24, 2012 10:54AM - 11:06AM |
H1.00003: Update of Reaction Rates for Big Bang Nucleosynthesis John Fuqua, Carlos Bertulani Big Bang Nucleosynthesis (BBN) is one of the most important evidences of the validity of the Standard Model in Cosmology. During the Big Bang the Universe evolved very rapidly and only the lightest nuclides (e.g., D, 3He, 4He, and 7Li) could be synthesized. The abundances of these nuclides are probes of the conditions of the Universe during the very early stages of its evolution. Sensitivity to the several physics inputs in the BBN have been investigated thoroughly in the past. An important recent development is the need to account for the effect of re-estimated reaction rates on the BBN. Here we will examine the effects of new methods for obtaining nuclear reactions used as input in BBN evolution codes. [Preview Abstract] |
Saturday, March 24, 2012 11:06AM - 11:18AM |
H1.00004: Why Is There More Matter Than Antimatter In The Universe? Lionel D. Hewett One of the most fundamental laws of particle physics is the conservation of baryon number in essentially all of the interactions of the Standard Model. In other words, the amount of matter in the universe minus the amount of antimatter must remain forever a constant. Since this difference currently is a positive quantity, it must have always been positive. But there appears to be a perfect symmetry between matter and antimatter, so logic tells us that there should have been equal amounts during the creation process, thereby rendering a baryonic excess equal to zero. Several theories have been proposed to explain why this excess is positive. Such theories generally go beyond the Standard Model into a Grand Unified Theory that utilizes the chiral anomaly to predict such things as proton decay. The Time-Symmetric Model of Cosmology utilizes the fact that black hole absorption violates the conservation of baryon number to explain the current baryonic excess. More specifically it predicts that the Hawking radiation of evaporating primordial black holes violate the conservation of baryon number sufficiently to renders the baryonic excess of matter over antimatter as observed today. [Preview Abstract] |
Saturday, March 24, 2012 11:18AM - 11:30AM |
H1.00005: Symmetry, structure, and causets in discrete quantum gravity Sergio Pissanetzky A recent approach in quantum gravity proposes: (1) spacetime is discrete and structured as a causet of events; (2) the transition from continuous to discrete spacetime is a real quantization; (3) all other quantities, such as time, volume, geometry, and matter, are intrinsic properties of the causet; and (4) particles arise as self-organized structures (arXiv: 1112.1064). Critical for this research is a full understanding of causets' intrinsic properties. A general self-consistent theory of causets where only their intrinsic properties are used is proposed [Complexity, 17, 19 (2011)]. Causets are found nearly everywhere, and underlie nearly everything. They are equivalent to algorithms, acyclic digraphs, and canonical matrices. Any computer program is a causet written in the wrong language. They have extraordinary self-organizing properties. They form a fractal hierarchy of structures when a recently discovered universal functional is minimized. They exhibit a butterfly effect, deterministic chaos, and attractors with potential wells and levels. [Preview Abstract] |
Saturday, March 24, 2012 11:30AM - 11:42AM |
H1.00006: Absolutely relativity Mohsen Lutephy The light speed constancy is proved here and then it is not a principle suppose it is a proposition proved absolutely based on the Galilean transformation and simultaneity and this is a book full from new discoveries along the absolutely proof for Lorentz transformation. Even in a page I have proved Lorentz transformation by the brawer constant point based on the Galilean transformation until to show easily it is possible to generate absolutely relativity and this is not ether theorem suppose we are upon the new discoveries all mathematical and complete, not a theory. [Preview Abstract] |
Saturday, March 24, 2012 11:42AM - 11:54AM |
H1.00007: Comparison of cosmology and seabed acoustics measurements using statistical inference from maximum entropy David Knobles, Steven Stotts, Jason Sagers Why can one obtain from similar measurements a greater amount of information about cosmological parameters than seabed parameters in ocean waveguides? The cosmological measurements are in the form of a power spectrum constructed from spatial correlations of temperature fluctuations within the microwave background radiation. The seabed acoustic measurements are in the form of spatial correlations along the length of a spatial aperture. This study explores the above question from the perspective of posterior probability distributions obtained from maximizing a relative entropy functional. An answer is in part that the seabed in shallow ocean environments generally has large temporal and spatial inhomogeneities, whereas the early universe was a nearly homogeneous cosmological soup with small but important fluctuations. Acoustic propagation models used in shallow water acoustics generally do not capture spatial and temporal variability sufficiently well, which leads to model error dominating the statistical inference problem. This is not the case in cosmology. Further, the physics of the acoustic modes in cosmology is that of a standing wave with simple initial conditions, whereas for underwater acoustics it is a traveling wave in a strongly inhomogeneous bounded medium. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700