18,564 research outputs found
Connecting Dark Energy to Neutrinos with an Observable Higgs Triplet
To connect the scalar field (acceleron) responsible for dark energy to
neutrinos, the usual strategy is to add unnaturally light neutral singlet
fermions (right-handed neutrinos) to the Standard Model. A better choice is
actually a Higgs triplet, through the coupling of the acceleron to the
trilinear Higgs triplet-double-doublet interaction. This hypothesis predicts an
easily observable doubly-charged Higgs boson at the forthcoming Large Hadron
Collider (LHC).Comment: 9 page
Entanglement perturbation theory for the elementary excitation in one dimension
The entanglement perturbation theory is developed to calculate the excitation
spectrum in one dimension. Applied to the spin- antiferromagnetic
Heisenberg model, it reproduces the des Cloiseaux-Pearson Bethe ansatz result.
As for spin-1, the spin-triplet magnon spectrum has been determined for the
first time for the entire Brillouin zone, including the Haldane gap at
Reexamination of silicon effects on rice growth and production under field conditions using a low silicon mutant
Silicon (Si) is a beneficial element for healthy growth and high and sustainable production of rice, but the mode of action of the beneficial effects has not been well understood. We carried out field trials for four years at two different locations to re-examine the effects of Si on the growth and production of rice using a low silicon rice (lsi1) mutant. The mutant accumulated much lower Si at each growth stage compared with the wild-type rice (Oryza sativa L. cv Oochikara), but there was no difference in the accumulation of other nutrients including N, P, and K. Measurements at different growth stages showed that low Si in the mutant hardly affected the tiller number, chlorophyll content (SPAD value), and root growth. The plant height and shoot dry weight of the wild-type rice were slightly higher than those of the mutant at a later growth stage, but the difference was not significant between the two lines. However, grain yield was reduced by 79-98%, depending on year, due to a low Si accumulation in the mutant, which showed the largest effect of Si on rice production among all studies reported so far. Among the yield components, the percentage of filled spikelets was mostly affected, being only 13.9% of the wild-type rice in the mutant. The grain color of the mutant became brown because of excessive transpiration and infection of pathogens. These results indicate that Si increases rice yield mainly by enhancing the fertility of spikelets.</p
D4 Flavor Symmetry for Neutrino Masses and Mixing
We present the flavor symmetry, which is different from the
previous work by Grimus and Lavoura. Our model reduces to the standard model in
the low energy and there is no FCNC at the tree level. Putting the experimental
data, parameters are fixed, and then the implication of our model is discussed.
The condition to realize the tri-bimaximal mixing is presented. The possibility
for stringy realization of our model is also discussed.Comment: 10 pages, 1 figur
Unified picture for Dirac neutrinos, dark matter, dark energy and matter-antimatter asymmetry
We propose a unified scenario to generate the masses of Dirac neutrinos and
cold dark matter at the TeV scale, understand the origin of dark energy and
explain the matter-antimatter asymmetry of the universe. This model can lead to
significant impact on the Higgs searches at LHC.Comment: 5 pages, 3 figures. Title changed. Abstract, introduction and summary
revised. References added. Model and conclusion unchange
One-dimensional multicomponent fermions with delta function interaction in strong and weak coupling limits: Two-component Fermi gas
The Fredholm equations for one-dimensional two-component Fermions with
repulsive and with attractive delta-function interactions are solved by an
asymptotic expansion for A) strong repulsion, B) weak repulsion, C) weak
attraction and D) strong attraction. Consequently, we obtain the first few
terms of the expansion of ground state energy for the Fermi gas with
polarization for these regimes. We also prove that the two sets of the Fredhom
equations for weakly repulsive and attractive interactions are identical as
long as the integration boundaries match each other between the two sides. Thus
the asymptotic expansions of the energies of the repulsive and attractive
Fermions are identical to all orders in this region. The identity of the
asymptotic expansions may not mean that the energy analytically connects.Comment: 2 figures, 10 page
Excitation Spectrum of Antiferromagnetic Chains
The dynamical structure factor of the antiferromagnetic
Heisenberg chain with length 20 at zero temperature is calculated. The lowest
energy states have the delta-function peak at the region . At the lowest energy states are the lower-edge
of the continuum of the scattering state, the strength of which decreases for
large systems. This gives a reasonable explanation for the experimental fact
that no clear peak is observed at the region . This situation is more
apparent for valence-bond solid state. On the contrary for
antiferromagnetic Heisenberg chain the lowest energy states are always the edge
of the continuum.Comment: 14pages, Revtex 3.0, No.279
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