3,887 research outputs found
Abelian and non-Abelian statistics in the coherent state representation
We further develop an approach to identify the braiding statistics associated
to a given fractional quantum Hall state through adiabatic transport of
quasiparticles. This approach is based on the notion of adiabatic continuity
between quantum Hall states on the torus and simple product states---or
"patterns"---in the thin torus limit, together with a suitable coherent state
Ansatz for localized quasiholes that respects the modular invariance of the
torus. We give a refined and unified account of the application of this method
to the Laughlin and Moore-Read states, which may serve as a pedagogical
introduction to the nuts and bolts of this technique. Our main result is that
the approach is also applicable---without further assumptions---to more
complicated non-Abelian states. We demonstrate this in great detail for the
level Read-Rezayi state at filling factor . These results may
serve as an independent check of other techniques, where the statistics are
inferred from conformal block monodromies. Our approach has the benefit of
giving rise to intuitive pictures representing the transformation of
topological sectors during braiding, and allows for a self-consistent
derivation of non-Abelian statistics without heavy mathematical machinery.Comment: 38 pages, 11 figures, REVTeX 4-1; grammar and typo fixes, published
versio
Archaeological Research at the 1778-79 Winter Cantonment of the Continental Artillery, Pluckemin, New Jersey
No abstract available at this time
Gravitational waves from black hole collisions via an eclectic approach
We present the first results in a new program intended to make the best use
of all available technologies to provide an effective understanding of waves
from inspiralling black hole binaries in time for imminent observations. In
particular, we address the problem of combining the close-limit approximation
describing ringing black holes and full numerical relativity, required for
essentially nonlinear interactions. We demonstrate the effectiveness of our
approach using general methods for a model problem, the head-on collision of
black holes. Our method allows a more direct physical understanding of these
collisions indicating clearly when non-linear methods are important. The
success of this method supports our expectation that this unified approach will
be able to provide astrophysically relevant results for black hole binaries in
time to assist gravitational wave observations.Comment: 4 pages, 3 eps figures, Revte
Designing with Autonomous Tools: Video Games, Procedural Generation, and Creativity
Designers are increasingly using autonomous tools to perform complex activity more quickly and in different ways, often with little or no human intervention. These autonomous tools are changing the way many designers approach their work, and the creative outcomes of that work. On the one hand, autonomously generated designs might not provide the same creative user experience as manually designed con-tent, because autonomous tools are fundamentally deterministic in nature. On the other hand, the potentially creative benefits of using autonomous tools relate to the potential varietyâthat may be perceived as unpredictability by the designersâof their output. We report on a study of three cases of video game development that use procedural generation of content and we theorize about how organizations manage for creative user experiences when using autonomous tools in videogame production. We find that they address the inherent tension between determinism and variety by using a set of modular design practices that help guide autonomous tools in ways that allow for open-endedness and creativity. We refer to these practices as âarchitectural structuringâ and âinjecting varietyâ and we propose that the âlevel of modularityâ as well as the âlevel of manual designâ are critical for creative outcomes. We generate propositions associated with the two practices
Stabilizing Superconductivity in Nanowires by Coupling to Dissipative Environments
We present a theory for a finite-length superconducting nanowire coupled to
an environment. We show that in the absence of dissipation quantum phase slips
always destroy superconductivity, even at zero temperature. Dissipation
stabilizes the superconducting phase. We apply this theory to explain the
"anti-proximity effect" recently seen by Tian et. al. in Zinc nanowires.Comment: 4 pages, 3 figure
Steady and unsteady transonic small disturbance analysis of realistic aircraft configurations
A transonic unsteady aerodynamic and aeroelastic code called CAP-TSD (Computational Aeroelasticity Program - Transonic Small Disturbance) was developed for application to realistic aircraft configurations. It permits the calculation of steady and unsteady flows about complete aircraft configurations for aeroelastic analysis of the flutter critical transonic speed range. The CAP-TSD code uses a time accurate approximate factorization algorithm for solution of the unsteady transonic small disturbance potential equation. An overview is given of the CAP-TSD code development effort along with recent algorithm modifications which are listed and discussed. Calculations are presented for several configurations including the General Dynamics 1/9th scale F-16C aircraft model to evaluate the algorithm and hence the reliability of the CAP-TSD code in general. Calculations are also presented for a flutter analysis of a 45 deg sweptback wing which agree well with the experimental data. Descriptions are presented of the CAP-TSD code and algorithm details along with results and comparisons which demonstrate the stability, accuracy, efficiency, and utility of CAP-TSD
Extensive structureâactivity relationship study of albicidinâs Câterminal dipeptidic pâaminobenzoic acid moiety
Albicidin is a recently described natural product that strongly inhibits bacterial DNA gyrase. The pronounced activity, particularly against Gramânegative bacteria, turns it into a promising lead structure for an antibacterial drug. Hence, structureâactivity relationship studies are key for the inâdepth understanding of structural features/moieties affecting gyrase inhibition, antibacterial activity and overcoming resistance. The 27â
newly synthesized albicidins give profound insights into possibilities for variations of the Câterminus. Furthermore, in the present study, a novel derivative has been identified as overcoming resistance posed by the Klebsiellaâprotease AlbD. Structural modifications include, for example, azahistidine replacing the previous instable cyanoalanine as the central amino acid, as well as a triazole amide bond isostere between building blocksâ
D and E.BMBF, 03VP00030, Validierung einer neuen antibakteriellen Wirkstoffklasse - AlbiPharmTU Berlin, Open-Access-Mittel - 201
- âŚ