6,035 research outputs found
Nucleon sea in the effective chiral quark model
The asymmetries of both light-flavor antiquark and
strange-antistrange distributions of the nucleon sea are
considered with more details in the effective chiral quark model. We find that
the asymmetric distribution of light-flavor antiquarks
matches the experiment data well and that the asymmetry of strange and
antistrange distributions can bring about 60-100% correction to the NuTeV
anomaly of , which are three standard deviations from the
world average value measured in other electroweak processes. The results on the
correction to the NuTeV anomaly are insensitive to the inputs of the
constituent quark distributions and the cut-off parameters. The ratios of
and are also discussed, and it is
found that the ratio is compatible with the available
experiments with an additional symmetric sea contribution being considered
effectively.Comment: 24 Latex pages, 8 figure
Stochastic Averaging Principle for Dynamical Systems with Fractional Brownian Motion
Stochastic averaging for a class of stochastic differential equations (SDEs)
with fractional Brownian motion, of the Hurst parameter H in the interval (1/2,
1), is investigated. An averaged SDE for the original SDE is proposed, and
their solutions are quantitatively compared. It is shown that the solution of
the averaged SDE converges to that of the original SDE in the sense of mean
square and also in probability. It is further demonstrated that a similar
averaging principle holds for SDEs under stochastic integral of pathwise
backward and forward types. Two examples are presented and numerical
simulations are carried out to illustrate the averaging principle
Intertwined order and holography: the case of the parity breaking pair density wave
We present a minimal bottom-up extension of the Chern-Simons bulk action for
holographic translational symmetry breaking that naturally gives rise to pair
density waves. We construct stationary inhomogeneous black hole solutions in
which both the U(1) symmetry and spatially translational symmetry are
spontaneously broken at finite temperature and charge density. This novel
solution provides a dual description of a superconducting phase intertwined
with charge, current and parity orders.Comment: v3: Revised version in which the rules of effective field theory are
highlighted, to appear in Phys.Rev.Let
Analysis of Gγ-158(C→T) polymorphism in hemoglobin E/β-thalassemia major in Southern China
<p>Abstract</p> <p>Background</p> <p>The <sup>G</sup>γ-158(C→T) polymorphism plays important function in the clinical variability of HbE/β-thalassemia. There is little known about <sup>G</sup>γ-158(C→T) polymorphism in HbE/β-thalassemia major in Southern China. This study aimed to explore the association between HbE/β-thalassemia major and this polymorphism in Southern China.</p> <p>Methods and Results</p> <p>The frequency of the <sup>G</sup>γ-158(C→T) polymorphism has been evaluated in 32 patients with HbE/β-thalassemia major from Southern China. Further analysis of the <sup>G</sup>γ-158(C→T) polymorphism revealed the prominent frequency of this polymorphic pattern among HbE/β-thalassemia major patients (65.63%). The presence of this polymorphism was strongly correlated with the increase of HbF synthesis.</p> <p>Conclusions</p> <p>The frequency of the <sup>G</sup>γ-158(C→T) polymorphism was relatively high in Southern Chinese patients with HbE/β-thalassemia major, often accompanying with high production of HbF. This feature appears to be different with reports in other races and regions.</p
Competition between s-wave order and d-wave order in holographic superconductors
We study competition between s-wave order and d-wave order through two
holographic superconductor models. We find that once the coexisting phase
appears, it is always thermodynamically favored, and that the coexistence phase
is narrow and one condensate tends to kill the other. The phase diagram is
constructed for each model in terms of temperature and the ratio of charges of
two orders. We further compare the behaviors of some thermodynamic quantities,
and discuss the different aspects and identical ones between two models.Comment: 3 figures added, accepted by JHE
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