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The effects of internal fluctuations on a class of nonequilibrium statistical field theories

Description: A class of models with applications to swarm behavior as well as many other types of spatially extended complex biological and physical systems is studied. Internal fluctuations can play an active role in the organization of the phase structure of such systems. In particular, for the class of models studied here the effect of internal fluctuations due to finite size is a renormalized decrease in the temperature near the point of spontaneous symmetry breaking.
Date: July 1, 1993
Creator: Millonas, M. M.
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Partner: UNT Libraries Government Documents Department
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Constraining chameleon field theories using the GammeV afterglow experiments

Description: The GammeV experiment has constrained the couplings of chameleon scalar fields to matter and photons. Here we present a detailed calculation of the chameleon afterglow rate underlying these constraints. The dependence of GammeV constraints on various assumptions in the calculation is studied. We discuss GammeV-CHASE, a second-generation GammeV experiment, which will improve upon GammeV in several major ways. Using our calculation of the chameleon afterglow rate, we forecast model-independent co… more
Date: November 1, 2009
Creator: Upadhye, A.; Steffen, J. H. & Weltman, A.
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Partner: UNT Libraries Government Documents Department
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One-loop soft supersymmetry breaking terms in superstring effective theories.

Description: We perform a systematic analysis of soft supersymmetry breaking terms at the one loop level in a large class of string effective field theories. This includes the so-called anomaly mediated contributions. We illustrate our results for several classes of orbifold models. In particular, we discuss a class of models where soft supersymmetry breaking terms are determined by quasi model independent anomaly mediated contributions, with possibly non-vanishing scalar masses at the one loop level. We sh… more
Date: November 1, 2000
Creator: Binetruy, Pierre; Gaillard, Mary K. & Nelson, Brent D.
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Partner: UNT Libraries Government Documents Department
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DOE final technical report 3/1997 to 2/2005

Description: DOE final technical report 3/1997 to 2/2005 This grant supported basic theoretical research into the derivation (from relativistic field theories) of relativistic equations for few body systems, with practical applications to the properties of 2 and 3 nucleon systems and to the nature of few-quark systems.
Date: November 28, 2005
Creator: Gross, Franz, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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ANTIHYDROGEN PRODUCTION AND PRECISION SPECTROSCOPY WITH ATHENA/AD-1

Description: CPT invariance is a fundamental property of quantum field theories in flat space-time. Principal consequences include the predictions that particles and their antiparticles have equal masses and lifetimes, and equal and opposite electric charges and magnetic moments. It also follows that the fine structure, hyperfine structure, and Lamb shifts of matter and antimatter bound systems should be identical. It is proposed to generate new stringent tests of CPT using precision spectroscopy on antihyd… more
Date: November 1, 2000
Creator: HOLZSCHEITER, M.; AMSLER, C. & AL, ET
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Partner: UNT Libraries Government Documents Department
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Theoretical high energy physics research at the University of Chicago, Task A

Description: This report discusses research conducted at the University of Chicago in theoretical high energy physics. Some of the areas included in this report are: cp violation and cabibbo-kobayashi-maskawa matrix; radiative corrections and electroweak observables; heavy quark symmetry; heavy meson spectroscopy; hadronic string theory; composite models of quarks and leptons; and pedagogical effects. (LSP)
Date: April 1, 1992
Creator: Rosner, J.L.; Martinec, E.J. & Sachs, R.G.
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Partner: UNT Libraries Government Documents Department
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An introduction to baryon violation in standard electroweak theory

Description: I shall begin with a qualitative overview of the anomaly and B violation at zero and non-zero temperature, demonstrating how these processes may be understood on the back of an envelope. Then I shall discuss a part of the formalism necessary for doing calculations in more detail. Specifically, B violation is related to various solutions to the Euclidean equations of motion; instantons, sphalerons, and calorons (also called periodic instantons). The applicability of the various solutions may be … more
Date: December 1, 1990
Creator: Arnold, P.B.
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Partner: UNT Libraries Government Documents Department
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Physics of heavy quark decays and CP violation

Description: The phenomena of quark mixing in weak interaction are described. The current experimental status of the mixing matrix, charm and beauty particle decays, and CP violations are reported. Future interesting experiments are pointed out, especially in the event that higher generations of quarks exist. 78 refs., 5 figs.
Date: January 1, 1985
Creator: Chau, L. L.
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Partner: UNT Libraries Government Documents Department
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Dark matter and supersymmetry

Description: I review the possible candidates for cold dark matter suggested by supersymmetric theories and discuss the prospects for their experimental search. 24 refs., 2 figs.
Date: January 1, 1989
Creator: Giudice, G.F.
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Partner: UNT Libraries Government Documents Department
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A brief introduction to the strong CP problem

Description: The present status of the strong CP problem is briefly reviewed in a heuristic way. A crisis in EDMN calculation is explained. The equation of vacuum alignment obtained by the author and collaborators last year put a constraint on strong CP parameters. Thus the strong CP will be forced to vanish in one of the three scenarios characterized by axion, zero quark mass, and vanishing quark condensate. 12 refs.
Date: September 1, 1991
Creator: Wu, Dan-di (Superconducting Super Collider Lab., Dallas, TX (United States) Melbourne Univ., Parkville (Australia). School of Physics)
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Partner: UNT Libraries Government Documents Department
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Baryon and lepton number violation in the electroweak theory at TeV energies

Description: In the standard Weinberg-Salam electroweak theory baryon and lepton number (B and L) are NOT exactly conserved. The nonconservation of B and L can be traced to the existence of parity violation in the electroweak theory, together with the chiral current anomaly. This subtle effect gives negligibly small amplitudes for B and L violation at energies and temperatures significantly smaller than M{sub w} sin{sup 2} {theta}{sub w}/{alpha} {approximately} 10 TeV. However, recent theoretical work shows… more
Date: January 1, 1990
Creator: Mottola, E.
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Partner: UNT Libraries Government Documents Department
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Magnetic monopole catalysis of proton decay

Description: Catalysis of proton decay by GUT magnetic monopoles (the Rubakov-Callan effect) is discussed. Combining a short-distance cross section calculation by Bernreuther and Craigie with the long-distance velocity dependent distortion factors of Arafune and Fukugita, catalysis rate predictions which can be compared with experiment are obtained. At present, hydrogen rich detectors such as water (H/sub 2/O) and methane (CH/sub 4/) appear to be particularly well suited for observing catalysis by very slow… more
Date: September 1, 1986
Creator: Marciano, W. J. & Salvino, D.
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Partner: UNT Libraries Government Documents Department
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Supersymmetry and model building

Description: An introductory review of supersymmetry and supersymmetric model building is presented. The topics discussed include, a brief introduction to the formalism of supersymmetry, the gauge hierarchy problem, the minimal supersymmetric standard model and supersymmetric grand unified theories.
Date: June 1, 1986
Creator: Raby, S.
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Partner: UNT Libraries Government Documents Department
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Computation and graphics in mathematical research

Description: This report discusses: The description of the GANG Project and results for prior research; the center for geometry, analysis, numerics and graphics; description of GANG Laboratory; software development at GANG; and mathematical and scientific research activities.
Date: August 13, 1992
Creator: Hoffman, D. A. & Spruck, J.
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Partner: UNT Libraries Government Documents Department
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Charged current unitarity and extra neutral gauge bosons

Description: The experimental status of the Kobayashi-Maskawa-Cabibbo (KMC) matrix is surveyed and shown to provide a precision test of the standard model at the level of its O(..cap alpha..) radiative corrections. Implications for new physics and constraints of extra neutral gauge bosons are described. 12 refs., 1 fig.
Date: March 1, 1987
Creator: Marciano, W. J. & Sirlin, A.
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Partner: UNT Libraries Government Documents Department
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The Supersymmetric Generalized Modified KdV Hierarchy and Odd Minimal Superconformal Field Theories Coupled to 2D Supergravity: 2

Description: We further study the universal equations of the supersymmetric modified KdV (MKdV) hierarchy in its generalized form. We show that these equations describe the dynamical quantum equations of the odd series of N = 1 minimal (p,q) superconformal field theory coupled to N = 1 supergravity in particular those unitary series with p = 2k + 3, and q = 2k = 1. The string susceptibility of these models is {gamma}{sub sstr.}{sup (0)} = {minus}2/2k + 1. We demonstrate explicitly the cases k = 2; and k = 3… more
Date: January 1, 1990
Creator: Awada, M.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effective Field Theories of Baryons and Mesons, or, What Do Quarks Do?

Description: This thesis is an attempt to understand the properties of the protons, pions and other hadrons in terms of their fundamental building blocks. In the first chapter the author reviews several of the approaches that have already been developed. The Nambu-Jona-Lasinio model offers the classic example of a derivation of meson properties from a quark Lagrangian. The chiral quark model encodes much of the intuition acquired in recent decades. The author also discusses the non-linear sigma model, the S… more
Date: June 26, 1995
Creator: Keaton, G. L.
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Partner: UNT Libraries Government Documents Department
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Two exercises in supersymmetry: a low-energy supergravity model and free string field theory

Description: The new features of a supersymmetric standard model in the presence of heavy families are studied. The minimal set of Higgs fields, the desert between the electroweak and the grand unification scale and perturbative values of the dimensionless parameters throughout this region are assumed. Using the numerical as well as the approximate analytic solution of the renormalization group equations, the evolution of all the parameters of the theory are studied in the case of large Yukawa couplings for… more
Date: September 1, 1986
Creator: Preitschopf, C.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CP violation

Description: Predictions for CP violation in the three generation Standard Model are reviewed based on what is known about the Cabibbo-Kobayashi-Maskawa matrix. Application to the K and B meson systems are emphasized. 43 refs., 13 figs.
Date: December 1, 1989
Creator: Gilman, Frederick J.
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Partner: UNT Libraries Government Documents Department
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V/sub cd/ and V/sub cs/ from current models

Description: We discuss the theoretical uncertainties attendant to the determination of /vert bar/V/sub cd//vert bar///vert bar/V/sub cs//vert bar/ from semileptonic D decay. Four different theoretical approaches are considered. Currently, agreement at the level of a factor of 2 for the various theoretical approaches exists so that, indeed, precise experimental data -- such as precise lepton energy spectra and decay width data -- would discriminate among the models considered. 8 refs., 1 fig.
Date: July 1, 1989
Creator: Ward, B.F.L.
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Partner: UNT Libraries Government Documents Department
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