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Articles 1  30 of 1656
FullText Articles in Physics
YangMills Sources For Biconformal Gravity, Walter Davis Muhwezi
YangMills Sources For Biconformal Gravity, Walter Davis Muhwezi
Physics Capstone Project
We present a gauge formulation of YangMills matter sources for Biconformal gravity. Biconformal gravity is a 2ndimensional conformal gauge theory with a curvature linear action that has been shown to reproduce scale invariant general relativity on the cotangent bundle of ndimensional space time. We present a generalization of YangMills theories in biconformal space and show that the field equations with sources reduce the YangMills sector to ndimensional YangMills theory in curved spacetime. We compute the restrictive conditions on the energymomentum tensor required by the gravitational field equations.
Monitoring Ambient Laboratory Conditions With A Raspberry Pi, Joshua Boman
Monitoring Ambient Laboratory Conditions With A Raspberry Pi, Joshua Boman
Physics Capstone Project
Precise experimental devices and measurements can be sensitive to changing physical conditions in the lab. The purpose of this research was to develop a standardized computer automated package to monitor and record changes in laboratory conditions, including ambient temperature, atmospheric pressure, relative humidity, light intensity, motion, and power outages. The computerinterfaced device was based around an inexpensive Raspberry Pi microcomputer and commercially available sensors. The Raspberry Pi uploads the sensor data to a file used by LabVIEW to further analyze, plot and display the calibrated sensor data in real time and trigger alarms. This capability allows the Material Physics Research ...
Classification Of Isometry Algebras Of Solutions Of Einstein's Field Equations, Eugene Hwang
Classification Of Isometry Algebras Of Solutions Of Einstein's Field Equations, Eugene Hwang
All Graduate Theses and Dissertations
Since Schwarzschild found the first solution of the Einstein’s equations, more than 800 solutions were found. Solutions of Einstein’s equations are classified according to their Lie algebras of isometries and their isotropy subalgebras. Solutions were taken from the USU electronic library of solutions of Einstein’s field equations and the classification used Maple code developed at USU. This classification adds to the data contained in the library of solutions and provides additional tools for addressing the equivalence problem for solutions to the Einstein field equations. In this thesis, homogeneous spacetimes, hypersurfacehomogeneous spacetimes, RobinsonTrautman solutions, and some famous black ...
Introduction To Classical Field Theory, Charles G. Torre
Introduction To Classical Field Theory, Charles G. Torre
All Complete Monographs
This is an introduction to classical field theory. Topics treated include: KleinGordon field, electromagnetic field, scalar electrodynamics, Dirac field, YangMills field, gravitational field, Noether theorems relating symmetries and conservation laws, spontaneous symmetry breaking, Lagrangian and Hamiltonian formalisms.
Equatorial Disturbance Dynamo Vertical Plasma Drifts Over Jicamarca: Bi‐Monthly And Solar Cycle Dependence, Luis Navarro Dominguez, Bela G. Fejer, Ludger Scherliess
Equatorial Disturbance Dynamo Vertical Plasma Drifts Over Jicamarca: Bi‐Monthly And Solar Cycle Dependence, Luis Navarro Dominguez, Bela G. Fejer, Ludger Scherliess
All Physics Faculty Publications
We use extensive incoherent scatter radar observations from the Jicamarca Radio Observatory to study the local time and bi‐monthly dependence of the equatorial disturbance dynamo vertical plasma drifts on solar flux and geomagnetic activity. We show that the daytime disturbance drifts have generally small magnitudes with largest values before noon and an apparent annual variation. Near dusk, they are downward throughout the year with largest values during the equinoxes and smallest during June solstice. These downward drifts increase strongly with solar flux, and shift to later local times. They also increase with increasing geomagnetically active conditions with no apparent ...
BlandfordZnajek Process In Vacuo And Its Holographic Dual, Ted Jacobson, Maria J. Rodriguez
BlandfordZnajek Process In Vacuo And Its Holographic Dual, Ted Jacobson, Maria J. Rodriguez
All Physics Faculty Presentations
Blandford and Znajek discovered a process by which a spinning black hole can transfer rotational energy to a plasma, offering a mechanism for energy and jet emissions from quasars. Here we describe a version of this mechanism that operates with only vacuum electromagnetic fields outside the black hole. The setting, which is not astrophysically realistic, involves either a cylindrical black hole or one that lives in 2+1 spacetime dimensions, and the field is given in simple, closed form for a wide class of metrics. For asymptotically anti–de Sitter black holes in 2+1 dimensions, the holographic dual of ...
Pmc Turbo: Studying Gravity Wave And Instability Dynamics In The Summer Mesosphere Using Polar Mesospheric Cloud Imaging And Profiling From A Stratospheric Balloon, David C. Fritts, Amber D. Miller, C. Bjorn Kjellstrand, Christopher Geach, Bifford P. Williams, Bernd Kaifler, Natalie Kaifler, Glenn Jones, Markus Rapp, Michele Limon, Jason Reimuller, Ling Wang, Shaul Hanany, Sonja Gisinger, Yucheng Zhao, Gunter Stober, Cora E. Randall
Pmc Turbo: Studying Gravity Wave And Instability Dynamics In The Summer Mesosphere Using Polar Mesospheric Cloud Imaging And Profiling From A Stratospheric Balloon, David C. Fritts, Amber D. Miller, C. Bjorn Kjellstrand, Christopher Geach, Bifford P. Williams, Bernd Kaifler, Natalie Kaifler, Glenn Jones, Markus Rapp, Michele Limon, Jason Reimuller, Ling Wang, Shaul Hanany, Sonja Gisinger, Yucheng Zhao, Gunter Stober, Cora E. Randall
All Physics Faculty Publications
The Polar Mesospheric Cloud Turbulence (PMC Turbo) experiment was designed to observe and quantify the dynamics of small‐scale gravity waves (GWs) and instabilities leading to turbulence in the upper mesosphere during polar summer using instruments aboard a stratospheric balloon. The PMC Turbo scientific payload comprised seven high‐resolution cameras and a Rayleigh lidar. Overlapping wide and narrow camera field of views from the balloon altitude of ~38 km enabled resolution of features extending from ~20 m to ~100 km at the PMC layer altitude of ~82 km. The Rayleigh lidar provided profiles of temperature below the PMC altitudes and ...
Juxtaposition At 45 Km Of Temperatures From RayleighScatter Lidar And Reanalysis Models, David K. Moser
Juxtaposition At 45 Km Of Temperatures From RayleighScatter Lidar And Reanalysis Models, David K. Moser
All Graduate Theses and Dissertations
Weather and climate forecasts are almost exclusively produced by computer models, which use atmospheric measurements as starting points. It is a wellknown and jokedabout fact that model predictions can be incorrect at times. One of the reasons this happens is due to gaps in our knowledge of atmospheric conditions in areas where measurements don’t often taken place, such as the mesosphere, which stretches from roughly 4590 km altitude.
A lidar is a device that can shoot out short bursts of laser light to measure things such as atmospheric thickness at a distance. From this information one can then derive ...
Octonionic Maxwell Equations, Ben Shaw
Octonionic Maxwell Equations, Ben Shaw
Physics Capstone Project
An introduction to Quaternions and Octonions is given, and the Maxwell Equations are formulated in terms of each. The conventional, sourcefree relativistic theory of eight dimensional electromagnetism is introduced and examined. Similarly, the sourcefree Octonionic Maxwell Equations are developed, and it is shown that the seven dimensional electric and magnetic fields–pure Octonions–each admit plane wave solutions. An Octonionic Faraday tensor is constructed and compared with the conventional Faraday tensor, and it is shown that, in the sourcefree case, the conventional and Octonionic theories are equivalent.
General Relativity As A Biconformal Gauge Theory, James T. Wheeler
General Relativity As A Biconformal Gauge Theory, James T. Wheeler
All Physics Faculty Publications
We consider the conformal group of a space of dim n=p+q, with SO(p,q) metric. The quotient of this group by its homogeneous Weyl subgroup gives a principal fiber bundle with 2ndim base manifold and Weyl fibers. The Cartan generalization to a curved 2ndim geometry admits an action functional linear in the curvatures. Because symmetry is maintained between the translations and the special conformal transformations in the construction, these spaces are called biconformal; this same symmetry gives biconformal spaces overlapping structures with double field theories, including manifest Tduality. We establish that biconformal geometry ...
Porting Symbolic Libraries From Maple To Python, James Lewis
Porting Symbolic Libraries From Maple To Python, James Lewis
Physics Capstone Project
Utah State University has a database of tables of the known solutions of the Einstein Field Equation. This database is primarily recorded in the symbolic computing program Maple. This database needs to be translated into Python code so the information can be more accessible to the general public. This translation was successful for one table, which means that it is possible to translate the entire database.
Thermal Oxidation Of Silicon In A HomeMade Furnace System, Joshua Koskan
Thermal Oxidation Of Silicon In A HomeMade Furnace System, Joshua Koskan
Physics Capstone Project
I approached Dr. Shen with a desire for a project in understanding how to manage and expand the capabilities of a laboratory. After some discussion, my senior project was to complete a gas and water chiller system to an existing furnace for chemical vapor deposition. It should be able to handle temperatures up to 1100 ºC, hold a vacuum to mTorr, be easy to move samples in and out of the furnace, and cost effective.
Physics 4900, David Maughan
Physics 4900, David Maughan
Physics Capstone Project
More than a century has passed since Albert Einstein published his general theory of relativity. The theory has been tested many times experimentally, primarily in the relatively weak gravitational fields of the solar system [1,2]. More recently the first experimental results from the strong gravitational fields of two black holes have been measured in the form of gravitational waves, which are another prediction of general relativity. The 2017 Nobel prize in physics was awarded to Kip Thorne, Rainer Weiss, and Barry Barish for their role in the detection of gravitational waves. This year we have seen the first image ...
Mathematica Program To Compute Klein Gordon Equation For Generic Black Holes, Brant Smith
Mathematica Program To Compute Klein Gordon Equation For Generic Black Holes, Brant Smith
Physics Capstone Project
The goal of this project is to develop a program that will compute the Klein Gordon equation for generic Black Holes through the program Mathematica. This program will be available on Utah State websites for public usage. This project focuses on an understanding of General Relativity and more concretely on theoretical aspects of Black Holes. Developing the program begins with computing the Laplace equation in flat space to understand what it means to have empty space without a Black Hole. The Klein Gordon equation for a Schwarzschild Black Hole is then solved to show what happens once a static, nonrotating ...
Thermodynamic Properties Of Black Holes, Geoffrey Schulthess
Thermodynamic Properties Of Black Holes, Geoffrey Schulthess
Physics Capstone Project
Black Holes are some of the most mysterious objects in the known universe. In 1975, Stephen Hawking stated that Black Holes can behave as thermodynamical objects with a finite mass, spin, angular velocity, temperature, and entropy. This has been one of the most fascinating yet perplexing breakthroughs in our understanding of these strongly gravitating objects. In this context, the purpose of this research was to use Wolfram Mathematica to create a program that would calculate the thermodynamic properties of a black hole, given a certain metric.
Photochemistry On The Bottom Side Of The Mesospheric Na Layer, Tao Yuan, Wuhu Feng, John M. C. Plane, Daniel R. Marsh
Photochemistry On The Bottom Side Of The Mesospheric Na Layer, Tao Yuan, Wuhu Feng, John M. C. Plane, Daniel R. Marsh
All Physics Faculty Publications
Lidar observations of the mesospheric Na layer have revealed considerable diurnal variations, particularly on the bottom side of the layer, where more than an orderofmagnitude increase in Na density has been observed below 80 km after sunrise. In this paper, multiyear Na lidar observations are utilized over a full diurnal cycle at Utah State University (USU) (41.8o N, 111.8o W) and a global atmospheric model of Na with 0.5 km vertical resolution in the mesosphere and lower thermosphere (WACCMNa) to explore the dramatic changes of Na density on the bottom side of the layer. Photolysis of the ...
Photochemistry On The Bottom Side Of The Mesospheric Na Layer, Tao Yuan, Wuhu Feng, John M. C. Plane, Daniel R. Marsh
Photochemistry On The Bottom Side Of The Mesospheric Na Layer, Tao Yuan, Wuhu Feng, John M. C. Plane, Daniel R. Marsh
All Physics Faculty Publications
Lidar observations of the mesospheric Na layer have revealed considerable diurnal variations, particularly on the bottom side of the layer, where more than an orderofmagnitude increase in Na density has been observed below 80 km after sunrise. In this paper, multiyear Na lidar observations are utilized over a full diurnal cycle at Utah State University (USU) (41.8∘ N, 111.8∘ W) and a global atmospheric model of Na with 0.5 km vertical resolution in the mesosphere and lower thermosphere (WACCMNa) to explore the dramatic changes of Na density on the bottom side of the layer. Photolysis of the ...
Radar Studies Of HeightDependent Equatorial F Region Vertical And Zonal Plasma Drifts, S. A. Shidler, F. S. Rodrigues, Bela G. Fejer, M. A. Milla
Radar Studies Of HeightDependent Equatorial F Region Vertical And Zonal Plasma Drifts, S. A. Shidler, F. S. Rodrigues, Bela G. Fejer, M. A. Milla
All Physics Faculty Publications
We present the results of an analysis of longterm measurements of ionospheric F region E × B plasma drifts in the American/Peruvian sector. The analysis used observations made between 1986 and 2017 by the incoherent scatter radar of the Jicamarca Radio Observatory. Unlike previous studies, we analyzed both vertical and zonal components of the plasma drifts to derive the geomagnetically quiet time climatological variation of the drifts as a function of height and local time. We determine the average behavior of the height profiles of the drifts for different seasons and distinct solar flux conditions. Our results show good agreement ...
Water Entry Of Spheres At Various Contact Angles, Nathan B. Speirs, Mohammad M. Mansoor, Jesse Belden, Tadd T. Truscott
Water Entry Of Spheres At Various Contact Angles, Nathan B. Speirs, Mohammad M. Mansoor, Jesse Belden, Tadd T. Truscott
Mechanical and Aerospace Engineering Faculty Publications
It is well known that the water entry of a sphere causes cavity formation above a critical impact velocity as a function of the solidliquid contact angle (Duez et al. 2007). Using a rough sphere with a contact angle of 120^{◦}, Aristoff & Bush (2009) showed that there are four different cavity shapes dependent on the Bond and Weber numbers (i.e., quasistatic, shallow, deep and surface). We experimentally alter the Bond number, Weber number and contact angle of smooth spheres and find two key additions to the literature: 1) Cavity shape also depends on the contact angle; 2) the absence of a splash crown at low Weber number results in cavity formation below the predicted critical velocity. In addition, we find an alternate scaling for the Bond and Weber numbers that predicts cavity shapes for various impacting bodies (e.g., spheres, multidroplet streams and jets) on the same regime diagram, thus, merging the often separated ...
Thermal Structure Of The Mesopause Region During The Wadis2 Rocket Campaign, Raimund Wörl, Boris Strelnikov, Timo P. Viehl, Josef Höffner, PierreDominique Pautet, Michael J. Taylor, Yucheng Zhao, FranzJosef Lübken
Thermal Structure Of The Mesopause Region During The Wadis2 Rocket Campaign, Raimund Wörl, Boris Strelnikov, Timo P. Viehl, Josef Höffner, PierreDominique Pautet, Michael J. Taylor, Yucheng Zhao, FranzJosef Lübken
Publications
This paper presents simultaneous temperature measurements by three independent instruments during the WADIS2 rocket campaign in northern Norway (69^{◦} N, 14^{◦} E) on 5 March 2015. Vertical profiles were measured in situ with the CONE instrument. Continuous mobile IAP Fe lidar (Fe lidar) measurements during a period of 24 h, as well as horizontally resolved temperature maps by the Utah State University (USU) Advanced Mesospheric Temperature Mapper (AMTM) in the mesopause region, are analysed. Vertical and horizontal temperature profiles by all three instruments are in good agreement. A harmonic analysis of the Fe lidar measurements shows the presence of waves ...
Investigation Of An Unusual Thin Layer Descending Through The Upper Stratosphere, Houston D. Bentley
Investigation Of An Unusual Thin Layer Descending Through The Upper Stratosphere, Houston D. Bentley
Physics Capstone Project
Lidar observations on the night of 1920 February 2004 at Logan, Utah (41.74 N, 111.81 W) revealed a strange thin layer which descended from roughly 55 km to 30 km over seven hours. Approximations are made for the dimensions and descent rate of the layer. Although the particle radius and density are unknown, a range can be determined from the descent rate and reference to the sizes of known particles. Several possible sources for the layer are explored, concluding that an object entering the Earth’s atmosphere was the most probable cause.
Sensitivity Of The Opal Instrument For Gravity Wave Detection, Kenneth I. Zia
Sensitivity Of The Opal Instrument For Gravity Wave Detection, Kenneth I. Zia
All Graduate Theses and Dissertations
Knowing what goes on in the upper atmosphere (∼80140 km) is very important to the space science community. There are several competing forces that influence the temperature and densities of neutral molecules in that region. OPAL (Optical Profiling of the Atmospheric Limb) is funded by the National Science Foundation (NSF) to measure the temperature there using light from oxygen molecules (∼760 nm). To accomplish this,OPAL is built into a CubeSat (a satellite the size of a loaf of bread) to be launched from the International Space Station (ISS) at an altitude of about 400 km. This vantage point is ...
The Development Of Hydrodynamic And Kinetic Models For The Plasmasphere Refilling Problem Following A Geomagnetic Storm, Kausik Chatterjee
The Development Of Hydrodynamic And Kinetic Models For The Plasmasphere Refilling Problem Following A Geomagnetic Storm, Kausik Chatterjee
All Graduate Theses and Dissertations
The objective of this dissertation is the development of computer simulationbased models for the modeling of upper ionosphere, starting from the first principles. The models were validated by exact analytical benchmarks and are seen to be consistent with experimentally obtained results. This area of research has significant implications in the area of global communication. In addition, these models would lead to a better understanding of the physical processes taking place in the upper ionosphere.
Mesospheric Gravity Wave Climatology And Variances Over The Andes Mountains, Jonathan Rich Pugmire
Mesospheric Gravity Wave Climatology And Variances Over The Andes Mountains, Jonathan Rich Pugmire
All Graduate Theses and Dissertations
Look up! Travelling over your head in the air are waves. They are present all the time in the atmosphere all over the Earth. Now imagine throwing a small rock in a pond and watching the ripples spread out around it. The same thing happens in the atmosphere except the rock is a thunderstorm, the wind blowing over a mountain, or another disturbance. As the wave (known as a gravity wave) travels upwards the thinning air allows the wave to grow larger and larger. Eventually the gravity wave gets too large – and like waves on the beach – it crashes causing ...
Mathematica Program To Compute Klein Gordon Equation For Generic Black Holes, Brant Smith
Mathematica Program To Compute Klein Gordon Equation For Generic Black Holes, Brant Smith
Physics Capstone Project
The goal of this project is to develop a program that will compute the Klein Gordon equation for generic Black Holes through the program Mathematica. This program will be available on Utah State websites for public usage. This project focuses on an understanding of General Relativity and more concretely on theoretical aspects of Black Holes. Developing the program begins with computing the Laplace equation in flat space to understand what it means to have empty space without a Black Hole. The Klein Gordon equation for a Schwarzschild Black Hole is then solved to show what happens once a static, nonrotating ...
Impact Of Bubble Baths On Stainless Steel Sphere Water Entry, Wesley Robinson
Impact Of Bubble Baths On Stainless Steel Sphere Water Entry, Wesley Robinson
Physics Capstone Project
Soap Bubbles on the water surface would seem to be an intuitive means for splash suppression, but their presence appears to be a double edged sword. We present on the water entry of hydrophilic spheres where the liquid surface is augmented by the presence of a bubble layer, similar to a bubble bath. While the presence of a bubble layer can diminish splashing upon impact at low Weber numbers, it also induces cavity formation at speeds below the critical velocity. The formation of a cavity generally results in larger Worthington jets and thus, larger amounts of ejected liquid. Bubble layers ...
Rectifying GarbageIn Equals GarbageOut Using A Secondary Electron Yield Materials Database, Phil Lundgreen, Jr Dennison
Rectifying GarbageIn Equals GarbageOut Using A Secondary Electron Yield Materials Database, Phil Lundgreen, Jr Dennison
Presentations
No abstract provided.
An Introduction To QuantileQuantile Plots For The Experimental Physicist, Allen Andersen, Jr Dennison
An Introduction To QuantileQuantile Plots For The Experimental Physicist, Allen Andersen, Jr Dennison
Journal Articles
No abstract provided.
Entry Of A Sphere Into A WaterSurfactant Mixture And The Effect Of A Bubble Layer, Nathan Speirs, Mohammad Mansoor, Randy Hurd, Saberul Sharker, W. G. Robinson, B. J. Williams, Tadd T. Truscott
Entry Of A Sphere Into A WaterSurfactant Mixture And The Effect Of A Bubble Layer, Nathan Speirs, Mohammad Mansoor, Randy Hurd, Saberul Sharker, W. G. Robinson, B. J. Williams, Tadd T. Truscott
Mechanical and Aerospace Engineering Faculty Publications
A rigid sphere entering a liquid bath does not always produce an entrained air cavity. Previous experimental work shows that cavity formation, or the lack thereof, is governed by fluid properties, wetting properties of the sphere, and impact velocity. In this study, wetting steel spheres are dropped into a watersurfactant mixture with and without passing through a bubble layer first. Surprisingly, in the case of a watersurfactant mixture without a bubble layer, the critical velocity for cavity formation becomes radius dependent. This occurs due to dynamic surface tension effects, with the local surface tension in the splash increasing during surface ...
Fluted Films, Nathan B. Speirs, Mohammad M. Mansoor, Jesse Belden, Randy C. Hurd, Zhao Pan, Tadd T. Truscott
Fluted Films, Nathan B. Speirs, Mohammad M. Mansoor, Jesse Belden, Randy C. Hurd, Zhao Pan, Tadd T. Truscott
Mechanical and Aerospace Engineering Faculty Publications
This paper is associated with a poster winner of a 2017 APS/DFD Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original poster is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.P0030