22,565 research outputs found
Introduction of Organic Eprints
Organic Eprints is an open, on-line archive for research in organic food and farming with more than 10,000 publications - and growing rapidly. All use of the archive is free of charge. There are 15,000 registered users of Organic Eprints, and the archive has more than 175,000 visits each month. The archive contains scientific and popular articles, reports, presentations, project descriptions, books and other research publications. For each publication there is a short summary along with information about authors and contacts, publishing details, peer review status, subject area and research affiliation. In most cases, the full articles are freely available for download
Jordan cells in logarithmic limits of conformal field theory
It is discussed how a limiting procedure of conformal field theories may
result in logarithmic conformal field theories with Jordan cells of arbitrary
rank. This extends our work on rank-two Jordan cells. We also consider the
limits of certain three-point functions and find that they are compatible with
known results. The general construction is illustrated by logarithmic limits of
(unitary) minimal models in conformal field theory. Characters of
quasi-rational representations are found to emerge as the limits of the
associated irreducible Virasoro characters.Comment: 16 pages, v2: discussion of three-point functions and characters
included; ref. added, v3: version to be publishe
A non-reductive N=4 superconformal algebra
A new N=4 superconformal algebra (SCA) is presented. Its internal affine Lie
algebra is based on the seven-dimensional Lie algebra su(2)\oplus g, where g
should be identified with a four-dimensional non-reductive Lie algebra. Thus,
it is the first known example of what we choose to call a non-reductive SCA. It
contains a total of 16 generators and is obtained by a non-trivial
In\"on\"u-Wigner contraction of the well-known large N=4 SCA. The recently
discovered asymmetric N=4 SCA is a subalgebra of this new SCA. Finally, the
possible affine extensions of the non-reductive Lie algebra g are classified.
The two-form governing the extension appearing in the SCA differs from the
ordinary Cartan-Killing form.Comment: 10 pages, LaTeX, version to be publishe
Polynomial Fusion Rings of Logarithmic Minimal Models
We identify quotient polynomial rings isomorphic to the recently found
fundamental fusion algebras of logarithmic minimal models.Comment: 18 page
Organic bread-wheat in New England, USA
In October 2010, researchers, farmers and millers from Maine and Vermont, USA, organized a trip to Denmark, in order to learn about local bread wheat production, milling and use from their more experienced counterparts with climates similar to their own.
They have received a grant over four years for the project antitled Enhancing Farmers’ Capacity to Produce High Quality Organic Bread Wheat in which they will carry out research, development and education to improve the production and quality of organic bread wheat in the two states
Purely affine elementary su(N) fusions
We consider three-point couplings in simple Lie algebras -- singlets in
triple tensor products of their integrable highest weight representations. A
coupling can be expressed as a linear combination of products of finitely many
elementary couplings. This carries over to affine fusion, the fusion of
Wess-Zumino-Witten conformal field theories, where the expressions are in terms
of elementary fusions. In the case of su(4) it has been observed that there is
a purely affine elementary fusion, i.e., an elementary fusion that is not an
elementary coupling. In this note we show by construction that there is at
least one purely affine elementary fusion associated to every su(N>3).Comment: 9 pages, LaTe
Transplacental transmission of field and rescued strains of BTV-2 and BTV-8 in experimentally infected sheep
Transplacental transmission of bluetongue virus has been shown previously for the North European strain of serotype 8 (BTV-8) and for tissue culture or chicken egg-adapted vaccine strains but not for field strains of other serotypes. In this study, pregnant ewes (6 per group) were inoculated with either field or rescued strains of BTV-2 and BTV-8 in order to determine the ability of these viruses to cross the placental barrier. The field BTV-2 and BTV-8 strains was passaged once in Culicoides KC cells and once in mammalian cells. All virus inoculated sheep became infected and seroconverted against the different BTV strains used in this study. BTV RNA was detectable in the blood of all but two ewes for over 28 days but infectious virus could only be detected in the blood for a much shorter period. Interestingly, transplacental transmission of BTV-2 (both field and rescued strains) was demonstrated at high efficiency (6 out of 13 lambs born to BTV-2 infected ewes) while only 1 lamb of 12 born to BTV-8 infected ewes showed evidence of in utero infection. In addition, evidence for horizontal transmission of BTV-2 between ewes was observed. As expected, the parental BTV-2 and BTV-8 viruses and the viruses rescued by reverse genetics showed very similar properties to each other. This study showed, for the first time, that transplacental transmission of BTV-2, which had been minimally passaged in cell culture, can occur; hence such transmission might be more frequent than previously thought
Flag Hilbert schemes, colored projectors and Khovanov-Rozansky homology
We construct a categorification of the maximal commutative subalgebra of the type A Hecke algebra. Specifically, we propose a monoidal functor from the (symmetric) monoidal category of coherent sheaves on the flag Hilbert scheme to the (non-symmetric) monoidal category of Soergel bimodules. The adjoint of this functor allows one to match the Hochschild homology of any braid with the Euler characteristic of a sheaf on the flag Hilbert scheme. The categorified Jones-Wenzl projectors studied by Abel, Elias and Hogancamp are idempotents in the category of Soergel bimodules, and they correspond to the renormalized Koszul complexes of the torus fixed points on the flag Hilbert scheme. As a consequence, we conjecture that the endomorphism algebras of the categorified projectors correspond to the dg algebras of functions on affine charts of the flag Hilbert schemes. We define a family of differentials dN on these dg algebras and conjecture that their homology matches that of the glN projectors, generalizing earlier conjectures of the first and third authors with Oblomkov and Shende
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