15,287 research outputs found
Higgs Boson Exempt No-Scale Supersymmetry with a Neutrino Seesaw: Implications for Lepton Flavor Violation and Leptogenesis
Motivated by the observation of neutrino oscillations, we extend the Higgs
boson exempt no-scale supersymmetry model (HENS) by adding three heavy
right-handed neutrino chiral supermultiplets to generate the light neutrino
masses and mixings. The neutrino Yukawa couplings can induce new lepton flavor
violating couplings among the soft terms in the course of renormalization group
running down from the boundary scale. We study the effects this has on the
predictions for low-energy probes of lepton flavor violation(LFV). Heavy
right-handed neutrinos also provide a way to generate the baryon asymmetry
through leptogenesis. We find that consistency with LFV and leptogenesis puts
strong requirements on either the form of the Yukawa mass matrix or the
smallness of the Higgs up soft mass. In all cases, we generically expect that
new physics LFV is non-zero and can be found in a future experiment.Comment: 25 pages, 11 figures; Added a referenc
Validation and Improvement of the Beef Production Sub-index in Ireland for Beef Cattle
End of project reportThe objectives of the following study were to:
a. Quantify the effect of sire genetic merit for BCI on:
1. feed intake, growth and carcass traits of progeny managed under bull or steer beef production
systems.
2. live animal scores, carcass composition and plasma hormone and metabolite concentrations in their
progeny.
b. Compare the progeny of :
1. Late-maturing beef with dairy breeds and
2. Charolais (CH), Limousin (LM), Simmental (SM) and Belgian Blue (BB) sires bred to beef suckler
dams,
for feed intake, blood hormones and metabolites, live animal measurements, carcass traits and carcass value in
bull and steer production systems
A fully integrated multi-channel detector for electron spectroscopy
In electron spectroscopy, multi-channel detection combined with intense radiation sources provides the optimum experimental configuration. Building on the 5 mm, 192-channel ion detector developed at Aberystwyth, longer arrays have been fabricated for the detection of electrons in a commercial hemispherical analyser. The performance and reliability of a 10 mm, 384-detector array is discussed and the first array-detected photoelectron spectroscopy data for single-crystal diamond are presented. In scanning mode, the detector shows a large improvement compared to single channeltron detection and this improvement allows data to be collected in snapshot mode (1 s per spectrum) to enable real-time measurements. © 2005 Elsevier B.V. All rights reserved
Rigid C^*-tensor categories of bimodules over interpolated free group factors
Given a countably generated rigid C^*-tensor category C, we construct a
planar algebra P whose category of projections Pro is equivalent to C. From P,
we use methods of Guionnet-Jones-Shlyakhtenko-Walker to construct a rigid
C^*-tensor category Bim whose objects are bifinite bimodules over an
interpolated free group factor, and we show Bim is equivalent to Pro. We use
these constructions to show C is equivalent to a category of bifinite bimodules
over L(F_infty).Comment: 50 pages, many figure
Membrane geometry with auxiliary variables and quadratic constraints
Consider a surface described by a Hamiltonian which depends only on the
metric and extrinsic curvature induced on the surface. The metric and the
curvature, along with the basis vectors which connect them to the embedding
functions defining the surface, are introduced as auxiliary variables by adding
appropriate constraints, all of them quadratic. The response of the Hamiltonian
to a deformation in each of the variables is examined and the relationship
between the multipliers implementing the constraints and the conserved stress
tensor of the theory established.Comment: 8 page
Spectral Measures and Generating Series for Nimrep Graphs in Subfactor Theory II: SU(3)
We complete the computation of spectral measures for SU(3) nimrep graphs
arising in subfactor theory, namely the SU(3) ADE graphs associated with SU(3)
modular invariants and the McKay graphs of finite subgroups of SU(3). For the
SU(2) graphs the spectral measures distill onto very special subsets of the
semicircle/circle, whilst for the SU(3) graphs the spectral measures distill
onto very special subsets of the discoid/torus. The theory of nimreps allows us
to compute these measures precisely. We have previously determined spectral
measures for some nimrep graphs arising in subfactor theory, particularly those
associated with all SU(2) modular invariants, all subgroups of SU(2), the
torus, SU(3), and some SU(3) graphs.Comment: 38 pages, 21 figure
Theoretical Study of Fluid Membranes of Spherical Topology with Internal Degrees of Freedom
A theoretical study of vesicles of topological genus zero is presented. The
bilayer membranes forming the vesicles have various degrees of intrinsic
(tangent-plane) orientational order, ranging from smectic to hexatic,
frustrated by curvature and topology. The field-theoretical model for these
`-atic' surfaces has been studied before in the low temperature (mean-field)
limit. Work presented here includes the effects of thermal fluctuations. Using
the lowest Landau level approximation, the coupling between order and shape is
cast in a simple form, facilitating insights into the behaviour of vesicles.
The order parameter contains vortices, whose effective interaction potential is
found, and renormalized by membrane fluctuations. The shape of the phase space
has a counter-intuitive influence on this potential. A criterion is established
whereby a vesicle of finite rigidity may be burst by its own in-plane order,
and an analogy is drawn with flux exclusion from a type-I superconductor.Comment: 34 pages + 4 Postscript figures. Uses RevTe
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