4,141 research outputs found
Renormalization of the antisymmetric tensor field propagator and dynamical generation of the mesons in Resonance Chiral Theory
We discuss the renormalization of the vector meson propagator within
Resonance chiral theory at one loop. Using the particular form of the
interaction Lagrangian we show that additional poles of the renormalized
propagator corresponding to degrees of freedom can be generated. We
give a concrete example of such an effect.Comment: 4 pages, 1 figure, to appear in Proceedings of the conference QCD 08,
Montpellier, 7-12 July 200
Using Digital Art to make the Tension beetween Capital and Commons Transparent. Innovation in shaping knowledge of Internet business practices as a form of cultural knowledge\ud
This paper examines a digital art performance by Ubermorgen.com called Google Will Eat Itself (GWEI.org) as an example of the tensions between Capital and the public commons. Using notions of transparency and knowledge as a form of innovation rooted in Nonaka’s Knowledge Management theory, it examines the ways in which knowledge about how Google uses the Internet is made explicit through the art performance. Finally, it discusses the implications for transparency in Internet business through both the act of GWEI expanding audiences for understanding Internet based revenue generation models and using artifacts rooted cultural contexts in order to challenge the assumptions inherent in the current configuration of Capital and the public commons. It ends with calling into question the role of Google as a form of “Cultureware,” dependent on the\ud
public commons, yet profiting from it in the realm of the Capital
The Euclidean Algorithm for Generalized Minimum Distance Decoding of Reed-Solomon Codes
This paper presents a method to merge Generalized Minimum Distance decoding
of Reed-Solomon codes with the extended Euclidean algorithm. By merge, we mean
that the steps taken to perform the Generalized Minimum Distance decoding are
similar to those performed by the extended Euclidean algorithm. The resulting
algorithm has a complexity of O(n^2)
Interfacial Magnetism in Manganite Superlattices
We use a two-orbital double-exchange model including Jahn-Teller lattice
distortions, superexchange interactions, and long-range Coulomb (LRC)
interactions to investigate the origin of magnetically disordered interfaces
between ferromagnetic metallic (FM) and antiferromagnetic insulating (AFI)
manganites in FM/AFI superlattices. The induced magnetic moment in the AFI
layer varies non-monotonically with increasing AFI layer width as seen in the
experiment. We provide a framework for understanding this non-monotonic
behavior which has a one-to-one correspondence with the magnetization of the FM
interface. The obtained insights provide a basis for improving the tunneling
magnetoresistance in FM/AFI manganite superlattices by avoiding a magnetic dead
layer (MDL) in the FM manganite.Comment: 5 pages, 5 figures. To appear in PR
Mirages, anti-mirages, and further surprises in quantum corrals with non-magnetic impurities
We investigate the local density of states (LDOS) for non-interacting
electrons in a hard wall ellipse in the presence of a single non-magnetic
scattering center. Using a T-matrix analysis we calculate the local Green's
function and observe a variety of quantum mirage effects for different impurity
positions. Locating the impurity near positions with LDOS maxima for the
impurity free corral can either lead to a reduction or an enhancement of the
LDOS at the mirror image point, i.e. a mirage or anti-mirage effect, or even
suppress LDOS maxima in the entire area of the corral.Comment: 6 pages, 7 figure
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