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The Moduli Space and M(Atrix) Theory of 9d N=1 Backgrounds of M/String Theory
We discuss the moduli space of nine dimensional N = 1 supersymmetric compactifications of M theory/string theory with reduced rank (rank 10 or rank 2), exhibiting how all the different theories (including M theory compactified on a Klein bottle and on a Moebius strip, the Dabholkar-Park background, CHL strings and asymmetric orbifolds of type II strings on a circle) fit together, and what are the weakly coupled descriptions in different regions of the moduli space. We argue that there are two disconnected components in the moduli space of theories with rank 2. We analyze in detail the limits of the M theory compactifications on a Klein bottle and on a Moebius strip which naively give type IIA string theory with an uncharged orientifold 8-plane carrying discrete RR flux. In order to consistently describe these limits we conjecture that this orientifold non-perturbatively splits into a D8-brane and an orientifold plane of charge (-1) which sits at infinite coupling. We construct the M(atrix) theory for M theory on a Klein bottle (and the theories related to it), which is given by a 2 + 1 dimensional gauge theory with a varying gauge coupling compactified on a cylinder with specific boundary conditions. We …
Date:
March 21, 2007
Creator:
Aharony, Ofer; /Weizmann Inst. /Stanford U., ITP /SLAC; Komargodski, Zohar; Patir, Assaf & Inst., /Weizmann
Object Type:
Report
System:
The UNT Digital Library
Towards a coherent theory of physics and mathematics.
None
Date:
January 21, 2002
Creator:
Benioff, P.
Object Type:
Article
System:
The UNT Digital Library
Reggeon Field Theory and the phases of QCD
We propose a Reggeon Field Theory phase diagram involving Sub-critical and Super-critical Pomeron behavior and the Expanding Disc. We describe the derivation of Reggeon Field Theory from QCD using infra-red analysis of the reggeon diagrams of the spontaneously broken theory. Matching the Reggeon Field Theory phase-diagram to that of lattice QCD with many fermions has significant implications for the chiral properties of continuum QCD when the number of flavors is less than the maximum allowed by asymptotic freedom. 19 refs., 7 figs.
Date:
July 21, 1987
Creator:
White, A.R.
Object Type:
Article
System:
The UNT Digital Library
Mass Communication Evangelism Symposium
Lecture given Wednesday, February 21, 1990, 11:00 AM at Abilene Christian University
Date:
February 21, 1990
Creator:
unknown
Object Type:
Sound
System:
The Portal to Texas History
Multigroup Diffusion Theory Calculations for Recent Critical Experiments
In connection with the program of the measurement of eta for U/sup 233/, several critical experiments were performed with light water solutions of uranyl nitrate in an essentially bare sphere 27 inches in diameter. Results of two multigroup-diffusion-theory calculations for the above experiments are presented. Assumed cross sections, material concentrations, detailed neutron balances, and a comparison with elementary theory are included. The agreement between the calculated and experimental multiplication constants is excellent for the multigroup calculation but only fair for the elementary calculation. The latter method overestimates the fast leakage so that the computed multiplication constant is less than that found experimentally. (auth)
Date:
July 21, 1959
Creator:
Nestor, C. W. Jr.
Object Type:
Report
System:
The UNT Digital Library
Interpretation of the Finite Pressure Gradient Effects in the Reversed Shear Alfvén Eigenmode Theory
Ideal MHD equations employed in the NOVA code are analyzed analytically and numerically in order to investigate the role of the pressure gradient on global reversed shear Alfvén eigenmodes (RSAEs) or Alfvén cascades. We confirm both numerically and analytically conclusions obtained earlier using the ideal MHD code NOVA and analytically that the plasma pressure gradient plays a key role in the existence condition and in the dispersion relation for the mode. The effect of the plasma pressure gradient is to shift the mode frequency up at the low part of the RSAE frequency chirp and downshift the mode frequency when the frequency approaches the TAE gap This finding is opposite to predictions in a recent publication , where the pressure gradient is found to be always stabilizing by means of downshifting the RSAE frequency and enhancing its in- teraction with the continuum. We resolve this discrepancy by showing that neglecting the pressure gradient effect on the plasma equilibrium (modification of the Shafranov shift and the averaged curvature) leads to conclusions at variance to the numerical and analytical results presented here. A new variational approximation of the RSAE is introduced which compares remarkably well with NOVA solutions. With this new approximation …
Date:
February 21, 2008
Creator:
N.N. Gorelenkov, G.J. Kramer, R. Nazikian
Object Type:
Report
System:
The UNT Digital Library
Kinetic theory and simulation of multi-species plasmas in tokamaks excited with ICRF microwaves
This paper presents a description of a bounce-averaged Fokker-Planck quasilinear model for the kinetic description of tokamak plasmas. The non-linear collision and quasilinear resonant diffusion operators are represented in a form conducive to numerical solution with specific attention to the treatment of the boundary layer separating trapped and passing orbit regions of velocity space. The numerical techniques employed are detailed in so far as they constitute significant departure from those used in the conventional uniform magnetic field case. Examples are given to illustrate the combined effects of collisional and resonant diffusion.
Date:
December 21, 1984
Creator:
Kerbel, G. D. & McCoy, M. G.
Object Type:
Report
System:
The UNT Digital Library
On Decays of B Mesons to a Strange Meson and an Eta or Eta' Meson at Babar
We describe studies of the decays of B mesons to final states {eta}K{sup *}(892), {eta}K{sup *}{sub 0}(S-wave), {eta}K{sup *}{sub 2}(1430), and {eta}'K based on data collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collier at the Stanford Linear Accelerator Center. We measure branching fractions and charge asymmetries for the decays B {yields} {eta}K{sup *}, where K{sup *} indicates a spin 0, 1, or 2 K{pi} system, making first observations of decays to final states {eta}K{sup *0}{sub 0}(S-wave), {eta}K{sup *+}{sub 0} (S-wave), and {eta}K{sup *0}{sub 2}(1430). We measure the time-dependent CP-violation parameters S and C for the decays B{sup 0} {yields} {eta}'K{sup 0}, observing CP violation in a charmless B decay with 5{sigma} significance considering both statistical and systematic uncertainties..
Date:
April 21, 2009
Creator:
Hirschauer, James Francis
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Discovering fake news embedded in the opposing hashtag activism networks on Twitter: #Gunreformnow vs. #NRA
This article is a study investigating fake news included in political discourse of opposing activism hashtags, #Gunreformnow and #NRA (The National Rifle Association) and aims to lay out the process of identifying fake news in the hashtag activism network on Twitter.
Date:
October 19, 2018
Creator:
Chong, Miyoung
Object Type:
Article
System:
The UNT Digital Library
Are print books REALLY dead? Exploring the relationship between technology acceptance and the use of e-books at a large research university
This presentation discusses a study of undergraduate students at the University of North Texas to understand factors related to students' intent to use and actual use of e-books.
Date:
November 21, 2016
Creator:
Rodriguez, Allyson; Billings, Emily & Smith, Susan
Object Type:
Presentation
System:
The UNT Digital Library
Joint Symposium on Politics, Media and Ministry - Civility in Media
Lecture given Monday, February 21, 2000, 11:00 AM at Abilene Christian University
Date:
February 21, 2000
Creator:
Poe, Ted
Object Type:
Sound
System:
The Portal to Texas History
Gaugino mass without singlets
In models with dynamical supersymmetry breaking in the hidden sector, the gaugino masses in the observable sector have been believed to be extremely suppressed (below 1 keV), unless there is a gauge singlet in the hidden sector with specific couplings to the observable sector gauge multiplets. We point out that there is a pure supergravity contribution to gaugino masses at the quantum level arising from the superconformal anomaly. Our results are valid to all orders in perturbation theory and are related to the ''exact'' beta functions for soft terms. There is also an anomaly contribution to the A terms proportional to the beta function of the corresponding Yukawa coupling. The gaugino masses are proportional to the corresponding gauge beta functions, and so do not satisfy the usual GUT relations.
Date:
December 21, 1998
Creator:
Giudice, Gian F.; Luty, Markus A.; Murayama, Hitoshi & Rattazzi, Riccardo
Object Type:
Article
System:
The UNT Digital Library
Assessment of ICT in Tertiary Education Applying Structural Equation Modeling and Rasch Model
Article studies information and communication technology (ICT) in tertiary education. This article is part of the special collection: Educational Psychology & Counseling, Educational Psychology.
Date:
December 21, 2020
Creator:
Spector, J. Michael; Islam, A. Y. M. Atiquil; Gu, Xiaoqing & Crook, Charles
Object Type:
Article
System:
The UNT Digital Library
Modeling of ICRH H-minority-driven n = 1 Resonant Modes in JET
A nonperturbative code NOVA-KN (Kinetic Nonperturbative) has been developed to account for finite orbit width (FOW) effects in nonperturbative resonant modes such as the low-frequency MHD modes observed in the Joint European Torus (JET). The NOVA-KN code was used to show that the resonant modes with frequencies in the observed frequency range are ones having the characteristic toroidal precession frequency of H-minority ions. Results are similar to previous theoretical studies of fishbone instabilities, which were found to exist at characteristic precession frequencies of hot ions.
Date:
August 21, 2003
Creator:
Gorelenkov, N. N.; Mantsinen, M. J.; Sharapov, S. E.; Cheng, C. Z. & Contributors, the JET-EFDA
Object Type:
Report
System:
The UNT Digital Library
CONCERNING K MIXING IN BOHR-MOTTELSON STATES OF SPHEROIDAL NUCLEI
None
Date:
September 21, 1955
Creator:
Rasmussen, John O.
Object Type:
Report
System:
The UNT Digital Library
Mathematical model of a utility firm. Final technical report, Part III
This project is aimed at understanding the economic and behavioral processes that take place within a utility firm, and without it. This volume covers dynamics of economic systems (Phase II of the project): economic equilibrium theory, discrete economics, exchange economics, production economics, approach to equilibrium.
Date:
August 21, 1983
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
High-resolution angle-resolved photoemission studies of high Tc superconductor Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8
An angle-resolved photoemission study of the normal and superconducting states in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} was performed. Measurements in the normal state show bands dispersing through the Fermi level from at least 350 meV below E{sub F}. The Fermi level crossings are consistant with local-density band calculation, including a point calculated to be of Bi-O character. Additional measurements were made where bands crossed the Fermi level between 100 and 250K, along with measurements on an adjacent Pt foil. The Fermi edges of both materials agree to within the noise. Below the Fermi level, the spectra show correlation effects on the form of an increased effective mass. The shape of the spectra can be explained by a lifetime-broadened photohole and secondary electrons. The effective inverse photohole lifetime is linear in energy. A superconducting gap has been measured at a number of points where there is density at the Fermi level in the normal state. By proper modeling, a gap of 24 meV was obtained for all these points, including points of Cu-O and Bi-O character respectively, according to band calculation. The lack of gap anisotropy in the basal plane suggests that pinning in this material is not d-wave pairing.
Date:
September 21, 1990
Creator:
Liu, Rong
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Transport Methods Conquering the Seven-Dimensional Mountain
In a wide variety of applications, a significant fraction of the momentum and energy present in a physical problem is carried by the transport of particles. Depending on the circumstances, the types of particles might involve some or all of photons, neutrinos, charged particles, or neutrons. In application areas that use transport, the computational time is usually dominated by the transport calculation. Therefore, there is a potential for great synergy; progress in transport algorithms could help quicken the time to solution for many applications. The complexity, and hence expense, involved in solving the transport problem can be understood by realizing that the general solution to the Boltzmann transport equation is seven dimensional: 3 spatial coordinates, 2 angles, 1 time, and 1 for speed or energy. Low-order approximations to the transport equation are frequently used due in part to physical justification but many times simply because a solution to the full transport problem is too computationally expensive. An example is the diffusion equation, which effectively drops the two angles in phase space by assuming that a linear representation in angle is adequate. Another approximation is the grey approximation, which drops the energy variable by averaging over it. If the grey approximation …
Date:
July 21, 2003
Creator:
Graziani, Frank R. & Olson, Gordon L.
Object Type:
Article
System:
The UNT Digital Library
Mathematical model of a utility firm. Final technical report, Part IIA
This volume is part of a project aimed at developing an understanding of the dynamical processes that evolve within an electric utility firm, and without it. The volume covers organizational dynamics and many-person symmetric games. (DLC)
Date:
August 21, 1983
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Ultra-high brightness (10 sup 21 W/cm sup 2 ) laser facility
New short-pulse laser technology has made possible the production of extremely bright laser sources. The use of these new techniques on large scale Nd:Glass based laser systems would make it possible to produce 1000 TW (Petawatt) pulses. Such pulses would yield focused intensities exceeding 10{sup 21}W/cm{sup 2} corresponding to an electric field in excess of 100 e/a{sub 0}{sup 2} and an energy density equivalent to that of a 10 keV blackbody. Such a source would have important applications in x-ray laser research and lead to a fundamentally new class of experiments in atomic, nuclear, solid state, plasma and high-energy density physics. Such a facility could be constructed with existing chirped-pulse'' technology. A one-year period of research addressing outstanding technical questions can extend the technology resulting in a more compact and cost effective design. For this reason, we are seeking a Director's Initiative grant in the amount of $590,000 for FY89 to investigate these issues. An equivalent amount in personnel and facilities would be provided by Y-Division. The study will include development of a chirped-pulse'' front-end capable of producing laser pulses of 2 J at 1.053 {mu}m with a 1 psec pulsewidth laser. Upon completion, this front-end will be installed on …
Date:
March 21, 1990
Creator:
Perry, M. D.; Campbell, E. M.; Hunt, J. T.; Keane, C.; Szoke, A. (Lawrence Livermore National Lab., CA (USA)); Mourou, G. et al.
Object Type:
Article
System:
The UNT Digital Library
Nuclear criticality safety experiments, calculations, and analyses - 1958 to 1982. Volume 2. Summaries. Complilation of papers from the Transactions of the American Nuclear Society
This compilation contains 688 complete summaries of papers on nuclear criticality safety as presented at meetings of the American Nuclear Society (ANS). The selected papers contain criticality parameters for fissile materials derived from experiments and calculations, as well as criticality safety analyses for fissile material processing, transport, and storage. The compilation was developed as a component of the Nuclear Criticality Information System (NCIS) now under development at the Lawrence Livermore National Laboratory. The compilation is presented in two volumes: Volume 1 contains a directory to the ANS Transaction volume and page number where each summary was originally published, the author concordance, and the subject concordance derived from the keyphrases in titles. Volume 2 contains-in chronological order-the full-text summaries, reproduced here by permission of the American Nuclear Society from their Transactions, volumes 1-41.
Date:
October 21, 1982
Creator:
Koponen, Brian L. & Hampel, Viktor E.
Object Type:
Report
System:
The UNT Digital Library
Nuclear criticality safety experiments, calculations, and analyses: 1958 to 1982. Volume 1. Lookup tables
This compilation contains 688 complete summaries of papers on nuclear criticality safety as presented at meetings of the American Nuclear Society (ANS). The selected papers contain criticality parameters for fissile materials derived from experiments and calculations, as well as criticality safety analyses for fissile material processing, transport, and storage. The compilation was developed as a component of the Nuclear Criticality Information System (NCIS) now under development at the Lawrence Livermore National Laboratory. The compilation is presented in two volumes: Volume 1 contains a directory to the ANS Transaction volume and page number where each summary was originally published, the author concordance, and the subject concordance derived from the keyphrases in titles. Volume 2 contains - in chronological order - the full-text summaries, reproduced here by permission of the American Nuclear Society from their Transactions, volumes 1-41.
Date:
October 21, 1982
Creator:
Koponen, B. L. & Hampel, V. E.
Object Type:
Report
System:
The UNT Digital Library
Stimulated Raman scatter from laser-produced plasmas: Merely nonlinear or also chaotic
Stimulated Raman scattering in plasmas is a three-wave instability with important practical consequences for laser fusion. Most studies of this process to date have focused on its threshold. Even the linear-theory threshold poses interesting problems; and observed thresholds have been difficult to interpret. However, with increasing evidence that this instability often becomes absolute, it has become appropriate to examine saturation mechanisms as well. A number of such mechanisms are discussed here, one of which has been reported to have a chaotic regime. 26 refs., 4 figs.
Date:
August 21, 1990
Creator:
Drake, R. P. & Batha, S. H.
Object Type:
Article
System:
The UNT Digital Library
Quantum physics in neuroscience and psychology: A neurophysicalmodel of the mind/brain interaction
Neuropsychological research on the neural basis of behavior generally posits that brain mechanisms will ultimately suffice to explain all psychologically described phenomena. This assumption stems from the idea that the brain is made up entirely of material particles and fields, and that all causal mechanisms relevant to neuroscience can therefore be formulated solely in terms of properties of these elements. Thus terms having intrinsic mentalistic and/or experiential content (e.g., ''feeling,'' ''knowing,'' and ''effort'') are not included as primary causal factors. This theoretical restriction is motivated primarily by ideas about the natural world that have been known to be fundamentally incorrect for more than three quarters of a century. Contemporary basic physical theory differs profoundly from classical physics on the important matter of how the consciousness of human agents enters into the structure of empirical phenomena. The new principles contradict the older idea that local mechanical processes alone can account for the structure of all observed empirical data. Contemporary physical theory brings directly and irreducibly into the overall causal structure certain psychologically described choices made by human agents about how they will act. This key development in basic physical theory is applicable to neuroscience, and it provides neuroscientists and psychologists with …
Date:
September 21, 2004
Creator:
Schwartz, Jeffrey M.; Stapp, Henry P. & Beauregard, Mario
Object Type:
Article
System:
The UNT Digital Library