14,954 research outputs found
Neutrino Mass Matrix Textures: A Data-driven Approach
We analyze the neutrino mass matrix entries and their correlations in a
probabilistic fashion, constructing probability distribution functions using
the latest results from neutrino oscillation fits. Two cases are considered:
the standard three neutrino scenario as well as the inclusion of a new sterile
neutrino that potentially explains the reactor and gallium anomalies. We
discuss the current limits and future perspectives on the mass matrix elements
that can be useful for model building.Comment: 25 pages, 18 figure
Quantum signatures in quadratic optomechanics
We analyze quantum effects occurring in optomechanical systems where the
coupling between an optical mode and a mechanical mode is quadratic in
displacement (membrane-in-the-middle geometry). We show that it is possible to
observe quantum effects in these systems without achieving the single-photon
strong coupling regime. We find that zero-point energy causes a mechanical
frequency shift, and we propose an experimental way to measure it. Further, we
show that it is possible to determine the phonon statistics from the cavity
transmission, and propose a way to infer the resonator's temperature based on
this feature. For completeness, we revisit the case of an isolated system and
show that different types of mechanical quantum states can be created,
depending on the initial cavity state. In this situation, mechanical motion
undergoes collapse and revivals, and we compute the collapse and revival times,
as well as the degree of squeezing.Comment: 7 pages, 6 figures, 2nd versio
What can we learn about the lepton CP phase in the next 10 years?
We discuss how the lepton CP phase can be constrained by accelerator and
reactor measurements in an era without dedicated experiments for CP violation
search. To characterize globally the sensitivity to the CP phase \delta_{CP},
we introduce a new measure, the CP exclusion fraction, which quantifies what
fraction of the \delta_{CP} space can be excluded at a given input values of
\theta_{23} and \delta_{CP}. Using the measure we study the CP sensitivity
which may be possessed by the accelerator experiments T2K and NOvA. We show
that, if the mass hierarchy is known, T2K and NOvA alone may exclude,
respectively, about 50%-60% and 40%-50% of the \delta_{CP} space at 90% CL by
10 years running, provided that a considerable fraction of beam time is devoted
to the antineutrino run. The synergy between T2K and NOvA is remarkable,
leading to the determination of the mass hierarchy through CP sensitivity at
the same CL.Comment: Analyses and plots improved, conclusions unchanged, 23 pages, 8
figures, 1 tabl
Boas práticas de armazenagem na indústria de alimentos.
Introdução. Definições. Armazenamento de matérias-primas e produtos acabados: armazenamento sob congelamento; armazenamento sob refrigeração; armazenamento à temperatura ambiente. Boas práticas de armazenagem - recomendações: áreas externas; áreas internas (edificações); recomendações de armazenagem. Estocagem de alimentos congelados e resfriados. Estocagem de substâncias perigosas. Estocagem e disposição de lixo.bitstream/item/34409/1/2000-DOC-0042.pd
Relative phase stability and lattice dynamics of NaNbO from first-principles calculations
We report total energy calculations for different crystal structures of
NaNbO over a range of unit cell volumes using the all-electron
full-potential (L)APW method. We employed both the local-density approximation
(LDA) and the Wu-Cohen form of the generalized gradient approximation (GGA-WC)
to test the accuracy of these functionals for the description of the complex
structural behavior of NaNbO. We found that LDA not only underestimates the
equilibrium volume of the system but also predicts an incorrect ground state
for this oxide. The GGA-WC functional, on the other hand, significantly
improves the equilibrium volume and provides relative phase stability in better
agreement with experiments. We then use the GGA-WC functional for the
calculation of the phonon dispersion curves of cubic NaNbO to identify the
presence of structural instabilities in the whole Brillouin zone. Finally, we
report comparative calculations of structural instabilities as a function of
volume in NaNbO and KNbO to provide insights for the understanding of
the structural behavior of KNaNbO solid solutions.Comment: Accepted for publication in Physical Review
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