2,337 research outputs found
Analysis of Quark Mixing Using Binary Tetrahedral Flavor Symmetry
Using the binary tetrahedral group , the three angles and phase of the
quark CKM mixing matrix are pursued by symmetry-breaking which involves
-doublet VEVs and the Chen-Mahanthappa CP-violation mechanism. The
NMRTM, Next-to-Minimal-Renormalizable -T-Model is described, and
its one parameter comparison to experimental data is explored.Comment: 14 pages latex. Two .eps figures include
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Spectral cues are necessary to encode azimuthal auditory space in the mouse superior colliculus.
Sound localization plays a critical role in animal survival. Three cues can be used to compute sound direction: interaural timing differences (ITDs), interaural level differences (ILDs) and the direction-dependent spectral filtering by the head and pinnae (spectral cues). Little is known about how spectral cues contribute to the neural encoding of auditory space. Here we report on auditory space encoding in the mouse superior colliculus (SC). We show that the mouse SC contains neurons with spatially-restricted receptive fields (RFs) that form an azimuthal topographic map. We found that frontal RFs require spectral cues and lateral RFs require ILDs. The neurons with frontal RFs have frequency tunings that match the spectral structure of the specific head and pinna filter for sound coming from the front. These results demonstrate that patterned spectral cues in combination with ILDs give rise to the topographic map of azimuthal auditory space
Effect of electron and hole doping on the structure of C, Si, and S nanowires
We use ab initio density functional calculations to study the effect of
electron and hole doping on the equilibrium geometry and electronic structure
of C, Si, and S monatomic wires. Independent of doping, all these nanowires are
found to be metallic. In absence of doping, C wires are straight, whereas Si
and S wires display a zigzag structure. Besides two preferred bond angles of 60
deg and 120 deg in Si wires, we find an additional metastable bond angle of 90
deg in S wires. The equilibrium geometry and electronic structure of these
nanowires is shown to change drastically upon electron and hole doping.Comment: 5 pages including 5 figure
Topology Changing Process of Coalescing Black Holes on Eguchi-Hanson Space
We numerically study the event horizons of two kinds of five-dimensional
coalescing black hole solutions with different asymptotic structures: the
five-dimensional Kastor-Traschen solution (5DKT) and the coalescing black hole
solution on Eguchi-Hanson space (CBEH). Topologies of the spatial infinity are
and , respectively. We show that
the crease sets of event horizons are topologically in 5DKT and
in CBEH, respectively. If we choose the time slices
which respect space-time symmetry, the first contact points of the coalescing
process is a point in the 5DKT case but a in the CBEH case. We also
find that in CBEH, time slices can be chosen so that a black ring with topology can be also formed during a certain intermediate
period unlike the 5DKT.Comment: 13 pages, 17 figure
Triviality and vacuum stability bounds in the three-loop neutrino mass model
We study theoretical constraints on the parameter space under the conditions
from vacuum stability and triviality in the three-loop radiative seesaw model
with TeV-scale right-handed neutrinos which are odd under the parity. In
this model, some of the neutrino Yukawa coupling constants can be of the order
of one. Requirement of strongly first order phase transition for successful
electroweak baryogenes is also prefers order-one coupling constants in the
scalar sector. Hence, it is important to clarify whether this model satisfies
those theoretical conditions up to a given cutoff scale. It is found that the
model can be consistent up to the scale above 10 TeV in the parameter region
where the neutrino data, the lepton flavor violation data, the thermal relic
abundance of dark matter as well as the requirement from the strongly first
order phase transition are satisfied.Comment: 22 pages, 14 figure
Current-driven resonant excitation of magnetic vortex
A magnetic vortex core in a ferromagnetic circular nanodot has a resonance
frequency originating from the confinement of the vortex core. By the
micromagnetic simulation including the spin-transfer torque, we show that the
vortex core can be resonantly excited by an AC (spin-polarized) current through
the dot and that the resonance frequency can be tuned by the dot shape. The
resistance measurement under the AC current successfully detects the resonance
at the frequency consistent with the simulation.Comment: 16 pages, 4 figure
Rotating Black Holes on Kaluza-Klein Bubbles
Using the solitonic solution generating techniques, we generate a new exact
solution which describes a pair of rotating black holes on a Kaluza-Klein
bubble as a vacuum solution in the five-dimensional Kaluza-Klein theory. We
also investigate the properties of this solution. Two black holes with topology
S^3 are rotating along the same direction and the bubble plays a role in
holding two black holes. In static case, it coincides with the solution found
by Elvang and Horowitz.Comment: 16 pages, 1 figure, minor correctio
Vacuum solutions of five dimensional Einstein equations generated by inverse scattering method
We study stationary and axially symmetric two solitonic solutions of five
dimensional vacuum Einstein equations by using the inverse scattering method
developed by Belinski and Zakharov. In this generation of the solutions, we use
five dimensional Minkowski spacetime as a seed. It is shown that if we restrict
ourselves to the case of one angular momentum component, the generated solution
coincides with a black ring solution with a rotating two sphere which was found
by Mishima and Iguchi recently.Comment: 10 pages, accepted for publication in Physical Review
Relationship Between Solitonic Solutions of Five-Dimensional Einstein Equations
We give the relation between the solutions generated by the inverse
scattering method and the B\"acklund transformation applied to the vacuum
five-dimensional Einstein equations. In particular, we show that the
two-solitonic solutions generated from an arbitrary diagonal seed by the
B\"acklund transformation are contained within those generated from the same
seed by the inverse scattering method.Comment: 17 pages, Some references are added, to be published in Phys.Rev.
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