11,052 research outputs found
Fermions in gravity and gauge backgrounds on a brane world
We solve the fermionic zero modes in gravity and gauge backgrounds on a brane
involving a warped geometry, and study the localization of spin 1/2 fermionic
field on the brane world. The result is that there exist massless spin 1/2
fermions which can be localized on the bulk with the exponentially decreasing
warp factor if including U(1) gauge background. Two special cases of gauge
backgrounds on the extra dimensional manifold are discussed.Comment: 11 pages, no figures, final versio
Intelectin contributes to allergen-induced IL-25, IL-33, and TSLP expression and type 2 response in asthma and atopic dermatitis.
The epithelial and epidermal innate cytokines IL-25, IL-33, and thymic stromal lymphopoietin (TSLP) have pivotal roles in the initiation of allergic inflammation in asthma and atopic dermatitis (AD). However, the mechanism by which the expression of these innate cytokines is regulated remains unclear. Intelectin (ITLN) is expressed in airway epithelial cells and promotes allergic airway inflammation. We hypothesized that ITLN is required for allergen-induced IL-25, IL-33, and TSLP expression. In two asthma models, Itln knockdown reduced allergen-induced increases in Il-25, Il-33, and Tslp and development of type 2 response, eosinophilic inflammation, mucus overproduction, and airway hyperresponsiveness. Itln knockdown also inhibited house dust mite (HDM)-induced early upregulation of Il-25, Il-33, and Tslp in a model solely inducing airway sensitization. Using human airway epithelial cells, we demonstrated that HDM-induced increases in ITLN led to phosphorylation of epidermal growth factor receptor and extracellular-signal regulated kinase, which were required for induction of IL-25, IL-33, and TSLP expression. In two AD models, Itln knockdown suppressed expression of Il-33, Tslp, and Th2 cytokines and eosinophilic inflammation. In humans, ITLN1 expression was significantly increased in asthmatic airways and in lesional skin of AD. We conclude that ITLN contributes to allergen-induced Il-25, Il-33, and Tslp expression in asthma and AD
Neutron Scattering Measurements of Spatially Anisotropic Magnetic Exchange Interactions in Semiconducting K0.85Fe1.54Se2 (TN=280 K)
We use neutron scattering to study the spin excitations associated with the
stripe antiferromagnetic (AFM) order in semiconducting
KFeSe (= K). We show that the spin wave spectra
can be accurately described by an effective Heisenberg Hamiltonian with highly
anisotropic in-plane couplings at = K. At high temperature (=
K) above , short range magnetic correlation with anisotropic correlation
lengths are observed. Our results suggest that, despite the dramatic difference
in the Fermi surface topology, the in-plane anisotropic magnetic couplings are
a fundamental property of the iron based compounds; this implies that their
antiferromagnetism may originate from local strong correlation effects rather
than weak coupling Fermi surface nesting.Comment: 5 pages, 4 figure
Self-Dual Vortices in the Fractional Quantum Hall System
Based on the -mapping theory, we obtain an exact Bogomol'nyi self-dual
equation with a topological term, which is ignored in traditional self-dual
equation, in the fractional quantum Hall system. It is revealed that there
exist self-dual vortices in the system. We investigate the inner topological
structure of the self-dual vortices and show that the topological charges of
the vortices are quantized by Hopf indices and Brouwer degrees. Furthermore, we
study the branch processes in detail. The vortices are found generating or
annihilating at the limit points and encountering, splitting or merging at the
bifurcation points of the vector field .Comment: 13 pages 10 figures. accepted by IJMP
Two-body charmed baryon decays involving decuplet baryon in the quark-diagram scheme
In the quark-diagram scheme, we study the charmed baryon decays of , where is or ,
together with () the decuplet baryon (pseudoscalar meson). It is
found that only two -exchange processes are allowed to contribute to . Particularly, we predict , which respects the
isospin symmetry. Besides, we take into account the flavor symmetry
breaking, in order to explain the observation of . For the decays involving , we predict
as the largest branching fractions in
the singly Cabibbo-suppressed decay
channels, respectively, which are accessible to the LHCb, BELLEII and BESIII
experiments.Comment: 12 pages, 1 figure, 3 tables, version to appear in EPJ
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