30,809 research outputs found
Derivation of Electroweak Chiral Lagrangian from One Family Technicolor Model
Based on previous studies deriving the chiral Lagrangian for pseudo scalar
mesons from the first principle of QCD in the path integral formalism, we
derive the electroweak chiral Lagrangian and dynamically compute all its
coefficients from the one family technicolor model. The numerical results of
the order coefficients obtained in this paper are proportional to the
technicolor number and the technifermion number ,
which agrees with the arguments in previous works, and which confirms the
reliability of this dynamical computation.Comment: 6 page
Non-degenerate colorings in the Brook's Theorem
Let and be two integers. We will call a proper coloring
of the graph a \textit{-nondegenerate}, if for any vertex of
with degree at least there are at least vertices of different colors
adjacent to it. In our work we prove the following result, which generalizes
Brook's Theorem. Let and be a graph without cliques on
vertices and the degree of any vertex in this graph is not greater than .
Then for every integer there is a proper -nondegenerate vertex
-coloring of , where During the primary proof,
some interesting corollaries are derived.Comment: 18 pages, 10 figure
Nodeless superconductivity in IrPtTe with strong spin-orbital coupling
The thermal conductivity of superconductor IrPtTe
( = 0.05) single crystal with strong spin-orbital coupling was measured down
to 50 mK. The residual linear term is negligible in zero magnetic
field. In low magnetic field, shows a slow field dependence. These
results demonstrate that the superconducting gap of IrPtTe is
nodeless, and the pairing symmetry is likely conventional s-wave, despite the
existence of strong spin-orbital coupling and a quantum critical point.Comment: 5 pages, 4 figure
Reconstruction of Cosmological Models From Equation of State of Dark Energy
We consider a class of five-dimensional cosmological solutions which contains
two arbitrary function and . We found that the arbitrary
function contained in the solutions can be rewritten in terms of the
redshift as a new arbitrary function . We further showed that this
new arbitrary function could be solved out for four known parameterized
equations of state of dark energy. Then the models can be reconstructed
and the evolution of the density and deceleration parameters of the universe
can be determined.Comment: 10 pages, 4 eps figures, ws-ijmpd.cls styl
Non-destructive measurement of the transition probability in a Sr optical lattice clock
We present the experimental demonstration of non-destructive probing of the
1S0-3P0 clock transition probability in an optical lattice clock with 87Sr
atoms. It is based on the phase shift induced by the atoms on a weak
off-resonant laser beam. The method we propose is a differential measurement of
this phase shift on two modulation sidebands with opposite detuning with
respect to the 1S0-1P1 transition, allowing a detection limited by the photon
shot noise. We have measured an atomic population of 10^4 atoms with a signal
to noise ratio of 100 per cycle, while keeping more than 95% of the atoms in
the optical lattice with a depth of 0.1 mK. The method proves simple and robust
enough to be operated as part of the whole clock setup. This detection scheme
enables us to reuse atoms for subsequent clock state interrogations,
dramatically reducing the loading time and thereby improving the clock
frequency stability.Comment: 4 pages, 5 figure
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