4,428 research outputs found
Lp Exponential Stability for the Equilibrium Solutions of the Navier-Stokes Equations
AbstractThe exponential stability of the solution of the Navier-Stokes equation in Lp, p > 2, p â 3, in bounded domain is considered in this paper. Under some assumptions on the external force, it can be shown that the bounded solution of the Navier-Stokes equation with initial and boundary conditions approaches the stationary solution of the system exponentially when time t goes to infinite
Average kinetic energy of heavy quark (ÎŒÏ2) inside heavy meson in 0â state by BetheâSalpeter method
AbstractThe average kinetic energy of the heavy quark inside B or D meson is computed by means of the instantaneous BetheâSalpeter method. We first solve the relativistic Salpeter equation and obtain the relativistic wave function and mass of 0â state, then we use the relativistic wave function to calculate the average kinetic energy of the heavy quark inside heavy meson of 0â state. We find that the relativistic corrections to the average kinetic energy of the heavy quark inside B or D meson are quite large and cannot be ignored. We estimate ÎŒ2Ï(=âλ1)â0.24(B0,B±), 0.20(D0,D±), 0.33(Bs), 0.26(Ds), 0.83(Bc) and 0.62(ηc) GeV2
Transport spectroscopy in a time-modulated open quantum dot
We have investigated the time-modulated coherent quantum transport phenomena
in a ballistic open quantum dot. The conductance and the electron dwell
time in the dots are calculated by a time-dependent mode-matching method. Under
high-frequency modulation, the traversing electrons are found to exhibit three
types of resonant scatterings. They are intersideband scatterings: into
quasibound states in the dots, into true bound states in the dots, and into
quasibound states just beneath the subband threshold in the leads. Dip
structures or fano structures in are their signatures. Our results show
structures due to 2 intersideband processes. At the above
scattering resonances, we have estimated, according to our dwell time
calculation, the number of round-trip scatterings that the traversing electrons
undertake between the two dot openings.Comment: 8 pages, 5 figure
On the Lattice of Strong Radicals
AbstractIt is shown that the class of all strong radicals containing the prime radical is not a sublattice of the lattice of all radicals. This gives a negative answer to some questions of Sands and Puczylowski
The flux pinning force and vortex phase diagram of single crystal FeTe0.60Se0.40
The flux pinning force density (Fp) of the single crystalline FeTe0.60Se0.40
superconductor has been calculated from the magnetization measurements. The
normalized Fp versus h (=H/Hirr) curves are scaled using the Dew-Hughes formula
to underline the pinning mechanism in the compound. The obtained values of
pinning parameters p and q indicate the vortex pinning by the mixing of the
surface and the point core pinning of the normal centers. The vortex phase
diagram has also been drawn for the first time for the FeTe0.60Se0.40, which
has very high values of critical current density Jc ~ 1.10(5) Amp/cm2 and the
upper critical field Hc2(0) = 65T, with a reasonably high transition
temperature Tc =14.5K.Comment: 12 pages, 4 figure
The rare top quark decays in the topcolor-assisted technicolor model
We consider the rare top quark decays in the framework of topcolor-assisted
technicolor (TC2) model. We find that the contributions of top-pions and
top-Higgs predicted by the TC2 model can enhance the SM branching ratios by as
much as 6-9 orders of magnitude. i.e., in the most case, the orders of
magnitude of branching ratios are , , . With the reasonable values of the
parameters in TC2 model, such rare top quark decays may be testable in the
future experiments. So, rare top quark decays provide us a unique way to test
TC2 model.Comment: 14 pages, 4 figure
Nano-constraints on the spatial anisotropy of the Gravitational Constant
We present constraints from various experimental data that limit any spatial
anisotropy of the Gravitational constant to less than a part per billion or
even smaller. This rules out with a wide margin the recently reported claim of
a spatial anisotropy of G with a diurnal temporal signature.Comment: Standard LaTex, 7 page
Virtual Effects of Split SUSY in Higgs Productions at Linear Colliders
In split supersymmetry the gauginos and higgsinos are the only supersymmetric
particles possibly accessible at foreseeable colliders like the CERN Large
Hadron Collider (LHC) and the International Linear Collider (ILC). In order to
account for the cosmic dark matter measured by WMAP, these gauginos and
higgsinos are stringently constrained and could be explored at the colliders
through their direct productions and/or virtual effects in some processes. The
clean environment and high luminosity of the ILC render the virtual effects of
percent level meaningful in unraveling the new physics effects. In this work we
assume split supersymmetry and calculate the virtual effects of the
WMAP-allowed gauginos and higgsinos in Higgs productions e+e- -> Z h and e+e-
-> \nu_e \bar_\nu_e h through WW fusion at the ILC. We find that the production
cross section of e+e- -> Zh can be altered by a few percent in some part of the
WMAP-allowed parameter space, while the correction to the WW-fusion process
e+e- -> \nu_e \bar_\nu_e h is below 1%. Such virtual effects are correlated
with the cross sections of chargino pair productions and can offer
complementary information in probing split supersymmetry at the colliders.Comment: more discussions added (7 pages, 10 figs
Decay Constants of Heavy Meson of State in Relativistic Salpeter Method
The decay constants of pseudoscalar heavy mesons of state are computed
by means of the relativistic (instantaneous) Salpeter equation. We solved the
full Salpeter equation without making any further approximation, such as
ignoring the small component wave function. Therefore, our results for the
decay constants include the complete relativistic contributions from the light
and the heavy quarks. We obtain , , , , and MeV.Comment: 9 pages, 1 figur
Anti-Jo-1 Syndrome presenting as cryptogenic organizing pneumonia
AbstractA 50-year-old Chinese lady presented with subacute onset of dyspnoea, bilateral infiltrates on chest X-ray and type I respiratory failure. There were minor symptoms of arthralgia and myalgia. Subsequent investigations confirmed that she had organizing pneumonia, polymyositis and serum anti-Jo-1 antibody. Treatment with corticosteroids resulted in prompt improvement of the respiratory condition and myositis
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