14,811 research outputs found
Cross-Correlation analysis of WMAP and EGRET in Wavelet Space
We cross correlate the Wilkinson Microwave Anisotropy Probe (WMAP) first year
data and the diffuse gamma-ray intensity maps from the Energetic Gamma Ray
Experiment Telescope (EGRET) using spherical wavelet approaches. Correlations
at 99.7% significance level have been detected, at scales around
in the WMAP foreground cleaned W-band and Q-band maps, based on data from
regions that are outside the most conservative WMAP foreground mask; no
significant correlation is found with the Tegmark cleaned map. The detected
correlation is most likely of Galactic origin, and thus can help us probing the
origins of possible Galactic foreground residuals and ultimately removing them
from measured microwave sky maps.Comment: 4 pages, 7 figures; accepted for publication in ApJ
The spacetime structure of MOND with Tully-Fisher relation and Lorentz invariance violation
It is believed that the modification of Newtonian dynamics (MOND) is possible
alternate for dark matter hypothesis. Although Bekenstein's TeVeS supplies a
relativistic version of MOND, one may still wish a more concise covariant
formulism of MOND. In this paper, within covariant geometrical framwork, we
present another version of MOND. We show the spacetime structure of MOND with
properties of Tully-Fisher relation and Lorentz invariance violation.Comment: 6 pages. arXiv admin note: substantial text overlap with
arXiv:1111.1383 and arXiv:1108.344
Determination of the strong coupling from semi-leptonic decay
According to heavy-meson chiral perturbation theory, the vector form factor
of exclusive semi-leptonic decay is closely
related, at least in the soft-pion region (i.e., ),
to the strong coupling or the normalized coupling .
Combining the precisely measured spectrum of decay by
the BaBar and Belle collaborations with several parametrizations of the form
factor , we can extract these couplings from the residue of the form
factor at the pole, which relies on an extrapolation of the form factor
from the semi-leptonic region to the unphysical point .
Comparing the extracted values with the other experimental and theoretical
estimates, we can test these various form-factor parametrizations, which differ
from each other by the amount of physical information embedded in. It is found
that the extracted values based on the BK, BZ and BCL parametrizations are
consistent with each other and roughly in agreement with the other theoretical
and lattice estimates, while the BGL ansatz, featured by a spurious, unwanted
pole at the threshold of the cut, gives a neatly larger value.Comment: 19 pages, no figure. Revise
Classification of GHZ-type, W-type and GHZ-W-type multiqubit entanglements
We propose the concept of SLOCC-equivalent basis (SEB) in the multiqubit
space. In particular, two special SEBs, the GHZ-type and the W-type basis are
introduced. They can make up a more general family of multiqubit states, the
GHZ-W-type states, which is a useful kind of entanglement for quantum
teleporatation and error correction. We completely characterize the property of
this type of states, and mainly classify the GHZ-type states and the W-type
states in a regular way, which is related to the enumerative combinatorics.
Many concrete examples are given to exhibit how our method is used for the
classification of these entangled states.Comment: 16 pages, Revte
Theoretical Study on Rotational Bands and Shape Coexistence of {Tl} in the Particle Triaxial-Rotor Model
By taking the particle triaxial-rotor model with variable moment of inertia,
we investigate the energy spectra, the deformations and the single particle
configurations of the nuclei Tl systemically. The calculated
energy spectra agree with experimental data quite well. The obtained results
indicate that the aligned bands observed in Tl originate from
the , , proton
configuration coupled to a prolate deformed core, respectively. Whereas, the
negative parity bands built upon the isomeric states in
Tl are formed by a proton with the
configuration coupled to a core with triaxial oblate deformation, and the
positive parity band on the isomeric state in Tl is
generated by a proton with configuration coupled to a
triaxial oblate core.Comment: 16 pages, 5 figures. To appear in Physical Review
Comparison of Power Dependence of Microwave Surface Resistance of Unpatterned and Patterned YBCO Thin Film
The effect of the patterning process on the nonlinearity of the microwave
surface resistance of YBCO thin films is investigated. With the use of a
sapphire dielectric resonator and a stripline resonator, the microwave of
YBCO thin films was measured before and after the patterning process, as a
function of temperature and the rf peak magnetic field in the film. The
microwave loss was also modeled, assuming a dependence of
on current density . Experimental and modeled results
show that the patterning has no observable effect on the microwave residual
or on the power dependence of .Comment: Submitted to IEEE Trans. MT
Tunneling Qubit Operation on a Protected Josephson Junction Array
We discuss a protected quantum computation process based on a hexagon
Josephson junction array. Qubits are encoded in the punctured array, which is
topologically protected. The degeneracy is related to the number of holes. The
topological degeneracy is lightly shifted by tuning the flux through specific
hexagons. We also show how to perform single qubit operation and basic quantum
gate operations in this system.Comment: 8 pages, 4 figures. The published version in Phys. Rev.,
A81(2010)01232
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