168,985 research outputs found
On the Composition of Gauge Structures
A formulation for a non-trivial composition of two classical gauge structures
is given: Two parent gauge structures of a common base space are synthesized so
as to obtain a daughter structure which is fundamental by itself. The model is
based on a pair of related connections that take their values in the product
space of the corresponding Lie algebras. The curvature, the covariant exterior
derivatives and the associated structural identities, all get contributions
from both gauge groups. The various induced structures are classified into
those whose composition is given just by trivial means, and those which possess
an irreducible nature. The pure irreducible piece, in particular, generates a
complete super-space of ghosts with an attendant set of super-BRST variation
laws, both of which are purely of a geometrical origin.Comment: Few elaborations are added to section 4 and section 5. To be
published in Journal of Physics A: Mathematical and General. 21 page
Partial Teleportation of Entanglement in the Noisy Environment
Partial teleportation of entanglement is to teleport one particle of an
entangled pair through a quantum channel. This is conceptually equivalent to
quantum swapping. We consider the partial teleportation of entanglement in the
noisy environment, employing the Werner-state representation of the noisy
channel for the simplicity of calculation. To have the insight of the many-body
teleportation, we introduce the measure of correlation information and study
the transfer of the correlation information and entanglement. We find that the
fidelity gets smaller as the initial-state is entangled more for a given
entanglement of the quantum channel. The entangled channel transfers at least
some of the entanglement to the final state.Comment: 8 pages, 2 figure
LHC Benchmarks from Flavored Gauge Mediation
We present benchmark points for LHC searches from flavored gauge mediation
models, in which messenger-matter couplings give flavor-dependent squark
masses. Our examples include spectra in which a single squark - stop, scharm,
or sup - is much lighter than all other colored superpartners, motivating
improved quark flavor tagging at the LHC. Many examples feature flavor mixing;
in particular, large stop-scharm mixing is possible. The correct Higgs mass is
obtained in some examples by virtue of the large stop A-term. We also revisit
the general flavor and CP structure of the models. Even though the A-terms can
be substantial, their contributions to EDM's are very suppressed, because of
the particular dependence of the A-terms on the messenger coupling. This holds
regardless of the messenger-coupling texture. More generally, the special
structure of the soft terms often leads to stronger suppression of flavor- and
CP-violating processes, compared to naive estimates.Comment: 32 pages, 11 figures. Updated to published versio
An Analysis of the Decay with Predictions from Heavy Quark and Chiral Symmetry
This paper considers the implications of the heavy quark and chiral
symmetries for the semi-leptonic decay . The general kinematic analysis for decays of the form {\sl
pseudoscalar meson vector meson pseudoscalar meson lepton
anti-lepton} is presented. This formalism is applied to the above exclusive
decay which allows the differential decay rate to be expressed in a form that
is ideally suited for the experimental determination of the different form
factors for the process through angular distribution measurements. Heavy quark
and chiral symmetry predictions for the form factors are presented, and the
differential decay rate is calculated in the kinematic region where chiral
perturbation theory is valid.Comment: 15 pages, uses jytex.tex and tables.tex; 3 figures not included but
available on reques
Coherence and superconductivity in coupled one-dimensional chains: a case study of YBaCuO
We report the infrared (IR) response of Cu-O chains in the high-
superconductor YBaCuO over the doping range spanning . We find evidence for a power law scaling at mid-IR frequencies
consistent with predictions for Tomonaga-Luttinger liquid, thus supporting the
notion of one-dimensional transport in the chains. We analyze the role of
coupling to the CuO planes in establishing metallicity and
superconductivity in disordered chain fragments.Comment: 4 pages, 3 figure
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