3,197 research outputs found
New massive supergravity multiplets
We present new off-shell formulations for the massive superspin-3/2
multiplet. In the massless limit, they reduce respectively to the old minimal
(n=-1/3) and non-minimal () linearized formulations for 4D N=1
supergravity. Duality transformations, which relate the models constructed, are
derived.Comment: 18 pages, LaTeX; v2: minor changes, references adde
Numerical simulation of large-scale ocean-atmosphere coupling and the ocean's role in climate
The problem of reducing model generated sigma coordinate data to pressure levels is considered. A mass consistent scheme for performing budget analyses is proposed, wherein variables interpolated to a given pressure level are weighted according to the mass between a nominal pressure level above and either a nominal pressure level below or the Earth's surface, whichever is closer. The method is applied to the atmospheric energy cycle as simulated by the OSU two level atmospheric general circulation model. The results are more realistic than sigma coordinate analyses with respect to eddy decomposition, and are in agreement with the sigma coordinate evaluation of the numerical energy sink. Comparison with less sophisticated budget schemes indicates superiority locally, but not globally
SMP: A solid modeling program
A prototype solid modeling program, SMP, developed by CSC for Langley Research Center (LaRC) is documented in this paper. The SMP software is employed by the System and Experiments Branch (SEB) of the Space Systems Division (SSD) for preliminary space station design, but is intended as a general purpose tool. The SMP document provides details concerning: the basic geometric modeling primitives and associated operators, the data representation scheme utilized to structure the geometric model, the available commands for both editing and displaying the solid model, the interactive user interface and the input/output interfaces to external software, and the utility of the package in the LaRC computing environment. The document is sufficiently detailed to serve both as a user's guide and reference manual
Two-Dimensional N=(2,2) Dilaton Supergravity from Graded Poisson-Sigma Models I: Complete Actions and Their Symmetries
The formalism of graded Poisson-sigma models allows the construction of
N=(2,2) dilaton supergravity in terms of a minimal number of fields. For the
gauged chiral U(1) symmetry the full action, involving all fermionic
contributions, is derived. The twisted chiral case follows by simple
redefinition of fields. The equivalence of our approach to the standard second
order one in terms of superfields is presented, although for the latter so far
only the bosonic part of the action seems to have been available in the
literature. It is shown how ungauged models can be obtained in a systematic way
and some relations to relevant literature in superstring theory are discussed.Comment: 26 p., LaTeX. v3: extended version, new title, new section on
ungauged model
SMP: A solid modeling program version 2.0
The Solid Modeling Program (SMP) provides the capability to model complex solid objects through the composition of primitive geometric entities. In addition to the construction of solid models, SMP has extensive facilities for model editing, display, and analysis. The geometric model produced by the software system can be output in a format compatible with existing analysis programs such as PATRAN-G. The present version of the SMP software supports six primitives: boxes, cones, spheres, paraboloids, tori, and trusses. The details for creating each of the major primitive types is presented. The analysis capabilities of SMP, including interfaces to existing analysis programs, are discussed
Complete Lagrangian formulation for N=4 topological string
We give a Lagrangian and display all local symmetries for N=4 topological
string by Berkovits, Vafa and Siegel, the latter previously known in the
superconformal gauge. Leading to a small N=4 superconformal algebra and
exhibiting the manifest Lorentz invariance the model is proposed to be a
framework for restoring the manifest Lorentz invariance in N=2 string
scattering amplitudes.Comment: 8 pages, LaTex. One reference corrected, to appear in Phys. Rev.
Two-Dimensional N=(2,2) Dilaton Supergravity from Graded Poisson-Sigma Models II: Analytic Solution and BPS States
The integrability of N=(2,2) dilaton supergravity in two dimensions is
studied by the use of the graded Poisson Sigma model approach. Though important
differences compared to the purely bosonic models are found, the general
analytic solutions are obtained. The latter include minimally gauged models as
well as an ungauged version. BPS solutions are an especially interesting
subclass.Comment: 23 p LaTe
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