1,547 research outputs found
On problem of polarization tomography, I
The polarization tomography problem consists of recovering a matrix function
f from the fundamental matrix of the equation
known for every geodesic of a given Riemannian metric. Here
is the orthogonal projection onto the hyperplan
. The problem arises in optical tomography of slightly
anisotropic media. The local uniqueness theorem is proved: a - small
function f can be recovered from the data uniquely up to a natural obstruction.
A partial global result is obtained in the case of the Euclidean metric on
A search for neutrino-antineutrino mass inequality by means of sterile neutrino oscillometry
The investigation of the oscillation pattern induced by the sterile neutrinos
might determine the oscillation parameters, and at the same time, allow to
probe CPT symmetry in the leptonic sector through neutrino-antineutrino mass
inequality. We propose to use a large scintillation detector like JUNO or LENA
to detect electron neutrinos and electron antineutrinos from MCi electron
capture or beta decay sources. Our calculations indicate that such an
experiment is realistic and could be performed in parallel to the current
research plans for JUNO and RENO. Requiring at least 5 confidence level
and assuming the values of the oscillation parameters indicated by the current
global fit, we would be able to detect neutrino-antineutrino mass inequality of
the order of 0.5% or larger, which would imply a signal of CPT anomalies.Comment: 14 pages, 10 figure
The trend of urban environment quality as an importaut factorof migration processes
Improving the quality of the urban environment allows the government to influence on large number of citizens, including changing their migration preferences. Urban development can offer a large amount of patriotism. The successes of socio-economic development of cities are confirmed by practice when the planned activities are fully implemented.At the same time, the goals are to consolidate the indigenous population of cities, to attract high-quality specialists from other cities with favorable living conditions. Such internal migration processes can be both permanent and temporary-all of them are aimed at creating socially necessary products. If such trends are supplemented by high wages in high-tech industries that implement advanced technologies, the influx of the required number of highly qualified specialists becomes very likely.Improvement of the quality of the urban environment and its ecological condition on high level is now a state-supported priority. It meets the criteria of social justice, focuses on a more active lifestyle of citizens, which has a positive impact on the health of the population. In addition, the health-improving effect of favorable living conditions is felt on a subconscious level, positively charging people with new energy, improving their mood and maintains their tone on a high emotional level.Improving the comfort of the living environment in addition to improved housing conditions provides for the improvement of infrastructure, a significant transformation of the surrounding landscaped areas, as well as socially significant public urban spaces that harmoniously complement the natural resource potential of settlements.All this in a complex influences on the positive public mood of society and helps to increase the competitive advantages of specific cities in the fight for human capital, affecting also the migration preferences of modern people
Twist-3 distribution amplitudes of scalar mesons from QCD sum rules
We study the twist-3 distribution amplitudes for scalar mesons made up of two
valence quarks based on QCD sum rules.
By choosing the proper correlation functions, we derive the moments of the
scalar mesons up to the first two order. Making use of these moments, we then
calculate the first two Gegenbauer coefficients for twist-3 distribution
amplitudes of scalar mesons. It is found that the second Gegenbauer
coefficients of scalar density twist-3 distribution amplitudes for
and mesons are quite close to that for , which indicates that the
SU(3) symmetry breaking effect is tiny here. However, this effect could not be
neglected for the forth Gegenbauer coefficients of scalar twist-3 distribution
amplitudes between and . Besides, we also observe that the first two
Gegenbauer coefficients corresponding to the tensor current twist-3
distribution amplitudes for all the , and are very small.
The renormalization group evolution of condensates, quark masses, decay
constants and moments are considered in our calculations. As a byproduct, it is
found that the masses for isospin I=1, scalar mesons are around
GeV and GeV respectively, while the mass for
isospin state composed of is GeV.Comment: replaced with revised version, to be published in Phys. Rev.
Quantum geometrodynamics for black holes and wormholes
The geometrodynamics of the spherical gravity with a selfgravitating thin
dust shell as a source is constructed. The shell Hamiltonian constraint is
derived and the corresponding Schroedinger equation is obtained. This equation
appeared to be a finite differences equation. Its solutions are required to be
analytic functions on the relevant Riemannian surface. The method of finding
discrete spectra is suggested based on the analytic properties of the
solutions. The large black hole approximation is considered and the discrete
spectra for bound states of quantum black holes and wormholes are found. They
depend on two quantum numbers and are, in fact, quasicontinuous.Comment: Latex, 32 pages, 5 fig
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