1,253 research outputs found
Halverson
No full textVideorecording of a modern dance graduate thesis concert presented March 12 and 13, 1981 on the University of Utah campus. The program consisted of four dance pieces, and the first, Spellfeud, was choreographed by the author. The other dances were title Distances, Monologue for a tortoise and Entwined weavings
Neoproterozoic-cambrian tectonics, global change and evolution: a focus on Southwestern Gondwana
No full textEdited by Claudio Gaucher, Alcides N. Sial, Galen P. Halverson and Hartwig E. Frimme
Dualities of deformed N = 2 SCFTs from link monodromy on D3-brane states
No full textAbstract We study D3-brane theories that are dually described as deformations of two different N = 2 superconformal theories with massless monopoles and dyons. These arise at the self-intersection of a seven-brane in F-theory, which cuts out a link on a small three-sphere surrounding the self-intersection. The spectrum is studied by taking small loops in the three-sphere, yielding a link-induced monodromy action on string junction D3-brane states, and subsequently quotienting by the monodromy. This reduces the differing flavor algebras of the N = 2 theories to the same flavor algebra, as required by duality, and projects out charged states, yielding an N = 1 superconformal theory on the D3-brane. In one, a deformation of a rank one Argyres-Douglas theory retains its SU(2) flavor symmetry and exhibits a charge neutral flavor triplet that is comprised of electron, dyon, and monopole string junctions. From duality we argue that the monodromy projection should also be imposed away from the conformal point, in which case the D3-brane field theory appears to exhibit confinement of electrons, dyons, and monopoles. We will address the mathematical counterparts in a companion paper
Toward a Neoproterozoic composite carbon-isotope record
No full textGalen P. Halverson, Paul F. Hoffman, Daniel P. Schrag, Adam C. Maloof, and A. Hugh N. Ric
Studies on the cyclic AMP response to thyroid stimulating immunoglobulin (TSI) and thyrotropin (TSH) in human thyroid cell monolayers
No full textStudies were conducted on the cultured human thyroid cell bioassay for thyroid stimulating immunoglobulin (TSI) and thyrotropin (TSH). In confirmation of the data of Kasagi, et al.,15 incubation of human thyroid cells in Hank's balanced salt solution deficient in NaCl increased the sensitivity of the c-AMP response to bovine TSH by approximately one order of magnitude. Half-maximal stimulation was attained at approximately 0.1 mU bTSH/ml. The effect of NaCl in the medium was greatest with stimulation by TSI > hTSH > bTSH. In contrast to incubations in NaCl(+) medium, with NaCl(-) medium most (70%-80%) of the c-AMP produced was released into the medium; this proportion remaining relatively constant over a wide range of bTSH and hTSH concentrations. At TSI concentrations higher than 3mg/ml efflux of c-AMP into the medium was significantly diminished. Stimulation by cholera toxin and prostaglandin E of thyroid cell c-AMP generation was not enhanced in NaCl(-) medium, in contrast to stimulation by TSH and TSI. The presence of 10-4M cycloheximide in NaCl(+) medium enhanced the c-AMP response to physiological concentrations of TSH. As with NaCl(-) medium, cycloheximide increased the sensitivity but not the maximum response of the c-AMP response to TSH. However no additivity was observed with NaCl(-) medium and cycloheximide. Human thyroid cells obtained from patients with Graves' disease are relatively insensitive to TSI stimulation. In NaCl(-) medium, however, the sensitivity of these cells to TSI stimulation is sufficient to enable them to be utilized in the TSI assay. The present state of the TSI assay is discussed. © 1982
Asymptotic behavior of the solutions to a family of PDE's arising from the chemotaxis equations of Keller and Segal
No full textThe system ut = uxx - (uvx)x, vt = u - Av is considered where A is a non-negative, self-adjoint operator which commutes with the Laplacian. The operator is considered to have eigenvalues lambda n = nrholambda1, and the system is considered on [0,1] x [0,T] with homogeneous Neumann boundary conditions. The operators which lead to global solutions and those that lead to solutions which blow up in finite time are considered as a function of rho, using an application of the methods of Hillen and Potapov [Math. Methods Appl. Sci., 27 (2004), pp. 1783-1801] to analyze the global case and those of Halverson, Levine, and Renclawowicz [Siam J. Appl. Math., 65 (2004), pp. 336--360; 66 (2005), pp. 361--364] to analyze the finite time blowup case. Some numerical results are provided to back up the analysis. Some questions and directions for future study are posed.</p
'Escape...The Orange Way' Rajneesh Newsletter
No full textAn article by Dean C. Halverson titled, 'Escape...The Orange Way,' from the SCP Newsletter of February-March 1982. This newsletter was issued by the 'Spiritual Counterfeits Project,' a Christian group connected to Campus Crusade for Christ that was dedicated to exposing religious frauds. The author provides a skeptical take on the teachings, standards and beliefs within the Rajneeshpuram commune. It describes the purpose of the self-sufficient city and how one can become a disciple to Bhagwan Shree Rajneesh. The text further explains the Rajneesh Foundation's intention to expand the city of Rajneeshpuram. The article was intended to warn others about the dangers of Rajneesh beliefs. This item was a part of the papers of Bob Oliver, Governor Atiyeh's legal counsel
Evidence of late Neoproterozoic glaciation in the Caledonides of NW Scandinavia
No full textF. Stodt, A.H.N. Rice, L. Björklund, G. Bax, G.P. Halverson and T.C. Pharao
Non-Abelian Gauge Symmetry and the Higgs Mechanism in F-Theory
No full textSingular fiber resolution does not describe the spontaneous breaking of gauge symmetry in F-theory, as the corresponding branch of the moduli space does not exist in the theory. Accordingly, even non-abelian gauge theories have not been fully understood in global F-theory compactifications. We present a systematic discussion of using singularity deformation, which does describe the spontaneous breaking of gauge symmetry in F-theory, to study non-abelian gauge symmetry. Since this branch of the moduli space also exists in the defining M-theory compactification, it provides the only known description of gauge theory states that exists in both pictures; they are string junctions in F-theory. We discuss how global deformations give rise to local deformations, and also give examples where local deformation can be utilized even in models where a global deformation does not exist. Utilizing deformations, we study a number of new examples, including non-perturbative descriptions of SU(3) and SU(2) gauge theories on seven-branes which do not admit a weakly coupled type IIb description. It may be of phenomenological interest that these non-perturbative descriptions do not exist for higher rank SU(N) theories
Matter from geometry without resolution
No full textWe utilize the deformation theory of algebraic singularities to study charged matter in compactifications of M-theory, F-theory, and type IIa string theory on elliptically fibered Calabi-Yau manifolds. In F-theory, this description is more physical than that of resolution. We describe how two-cycles can be identified and systematically studied after deformation. For ADE singularities, we realize non-trivial ADE representations as sublattices of ZN, where N is the multiplicity of the codimension one singularity before deformation. We give a method for the determination of Picard-Lefschetz vanishing cycles in this context and utilize this method for one-parameter smooth deformations of ADE singularities. We give a general map from junctions to weights and demonstrate that Freudenthal's recursion formula applied to junctions correctly reproduces the structure of high-dimensional ADE representations, including the 126 of SO(10) and the 43,758 of E6. We identify the Weyl group action in some examples, and verify its order in others. We describe the codimension two localization of matter in F-theory in the case of heterotic duality or simple normal crossing and demonstrate the branching of adjoint representations. Finally, we demonstrate geometrically that deformations correctly reproduce the appearance of non-simply-laced algebras induced by monodromy around codimension two singularities, showing the reduction of D4to G2in an example. A companion mathematical paper will follow. © SISSA 2013
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