11,970 research outputs found
Wilson lines and UV sensitivity in magnetic compactifications
We investigate the ultraviolet (UV) behaviour of 6D N=1 supersymmetric
effective (Abelian) gauge theories compactified on a two-torus () with
magnetic flux. To this purpose we compute offshell the one-loop correction to
the Wilson line state self-energy. The offshell calculation is actually
necessary to capture the usual effective field theory expansion in powers of
. Particular care is paid to the regularization of the
(divergent) momentum integrals, which is relevant for identifying the
corresponding counterterm(s). We find a counterterm which is a new higher
dimensional effective operator of dimension d=6, that is enhanced for a larger
compactification area (where the effective theory applies) and is consistent
with the symmetries of the theory. Its consequences are briefly discussed and
comparison is made with orbifold compactifications without flux.Comment: 12 pages, 1 figure; (v2: added references and paragraph on page 7
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Integrated Educational Project of Theoretical, Experimental, and Computational Analyses
This research demonstrates how to design an integrated capstone project by including theoretical, experimental and computational analyses of a truss bridge. The project mainly focused on leading students to approach engineering problems with various methods and to understand the advantages and disadvantages of each method. The students applied three methods to acquire the values of stresses and deflections of members in the given truss bridge. First, they calculated the stresses and deformations theoretically. Second, they actually conducted an experiment of the truss bridge with electronic measuring equipment. Lastly, they built two simulation models with Autodesk Inventor and Dassault Systèmes SolidWorks. From the comparisons of above three methods, students were guided to the validation of assumptions of theories.Cockrell School of Engineerin
Fragility of iron-based glasses
The viscosity of various iron-based bulk-glass-forming liquids is measured around the glass transition, and the associated fragility is calculated. Fragility is found to vary broadly between compositions, from a low value of ~43, which indicates fairly “strong” liquid behavior, to ~65, well within the region of “fragile” behavior. Despite a strong covalent bonding identified in the structure of this class of metal/metalloid glasses, their liquid fragility can be remarkably high, exceeding even the very fragile palladium and platinum bulk-glass formers. An inverse correlation between glass-forming ability and fragility is identified, suggesting that iron-based glasses are effectively “kinetically” stabilized
Communication and Monetary Policy
One role of monetary policy is to coordinate expectations in the economy and greater transparency of monetary policy may lead to greater coordination. But if transparentCommunication, Monetary policy, Transparency, Common knowledge
Spectral Broadening of Radiation from Relativistic Collapsing Objects
We study light curves and the spectral broadening of the radiation emitted
during the finite interval of time by a surface of a collapsing object. We
study a simplified model of monochromatic radiations from a spherical surface
which is assumed to be falling freely. We discuss the possible way how to infer
the physical parameters, such as the mass and radii of emission, from the light
curves and spectral broadenings.Comment: 4 pages, 4 figures, Typos are corrected and substantial parts of main
text are rephrased for more better presentation. 1 reference is adde
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