780 research outputs found
Building SO- models with symmetry
Using characters of finite group representations and monodromy of matter
curves in F-GUT, we complete partial results in literature by building SO models with dihedral discrete symmetry. We first
revisit the -and -models from the discrete
group character view, then we extend the construction to .\ We
find that there are three types of models
depending on the ways the -triplets break down in terms of
irreducible - representations: as
or $\left({\beta}\right) \boldsymbol{\
1}_{_{+,+}}\oplus \boldsymbol{1}_{_{+,-}}\oplus \boldsymbol{1}_{_{-,-}};\left({\gamma}\right) \mathbf{1}_{_{+,-}}\oplus \mathbf{2}_{_{0,0}}$.
Superpotentials and other features are also given.Comment: 20 pages, Nuclear Physics B (2015
Pairwise quantum and classical correlations in multi-qubits states via linear relative entropy
The pairwise correlations in a multi-qubit state are quantified through a
linear variant of relative entropy. In particular, we derive the explicit
expressions of total, quantum and classical bipartite correlations. Two
different bi-partioning schemes are considered. We discuss the derivation of
closest product, quantum-classical and quantum-classical product states. We
also investigate the additivity relation between the various pairwise
correlations existing in pure and mixed states. As illustration, some special
cases are examined.Comment: 19 pages, To appear in International Journal of Quantum Informatio
MSSM-like from Models
Using finite discrete group characters and symmetry breaking by hyperflux as
well as constraints on top- quark family, we study minimal low energy effective
theory following from SU models embedded in F-theory with non
abelian flux. Matter curves spectrum of the models is obtained from
SU theory with monodromy by performing two breakings;
first from symmetric group to subsymmetry; and next to dihedral
subgroup. As a consequence, and depending on the ways of decomposing
triplets of , we end with three types of - models. Explicit
constructions of these theories are given and a MSSM- like spectrum is derived.Comment: 48 pages, LaTe
Supersymmetry Partial Breaking and Tadpole Anomaly
We consider the extension of the effective
supersymmetric model of ; and study the
explicit relationship between partial breaking of supersymmetry
constraint and D3 brane tadpole anomaly of type IIB string on Calabi-Yau
threefolds in presence of H and H fluxes. We also comment on
supersymmetry breaking in the particular Maxwell
theory; and study its interpretation in connection with the tadpole anomaly
with extra localized flux sources.Comment: LaTex 37 page
Surface control system for the 15 meter hoop-column antenna
The 15-meter hoop-column antenna fabricated by the Harris Corporation under contract to the NASA Langley Research Center is described. The antenna is a deployable and restowable structure consisting of a central telescoping column, a 15-meter-diameter folding hoop, and a mesh reflector surface. The hoop is supported and positioned by 48 quartz cords attached to the column above the hoop, and by 24 graphite cords from the base of the antenna column. The RF reflective surface is a gold plated molybdenum wire mesh supported on a graphite cord truss structure which is attached between the hoop and the column. The surface contour is controlled by 96 graphite cords from the antenna base to the rear of the truss assembly. The antenna is actually a quadaperture reflector with each quadrant of the surface mesh shaped to produce an offset parabolic reflector. Results of near-field and structural tests are given. Controls structures and electromagnetics interaction, surface control system requirements, mesh control adjustment, surface control system actuator assembly, surface control system electronics, the system interface unit, and control stations are discussed
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