455 research outputs found
Effective Lagrangian and Dynamical Symmetry Breaking in the SU(2)XU(1) NJL Model
Dynamical symmetry breaking and the formation of scalar condensates in the
SU(2)XU(1) Nambu-Jona-Lasinio model with two coupling constants has been
studied in the framework of the mean field approximation. The bosonization
procedures of the model are performed using the functional integration method.
The possibility of the spontaneous CP symmetry breaking in the model under
consideration has been shown. The mass spectrum of the bound states of
fermions, as well as the effective Lagrangian of interacting scalar and
pseudoscalar mesons are obtained.Comment: 7 pages, LaTeX. Minor correction
Note on Dirac--K\"ahler massless fields
We obtain the canonical and symmetrical Belinfante energy-momentum tensors of
Dirac--K\"{a}hler's fields. It is shown that the traces of the energy-momentum
tensors are not equal to zero. We find the canonical and Belinfante dilatation
currents which are not conserved, but a new conserved dilatation current is
obtained. It is pointed out that the conformal symmetry is broken. The
canonical quantization is performed and the propagator of the massless fields
in the first-order formalism is found.Comment: 16 pages, minor corrections in the text, published versio
On Possible Light-Torsion Mixing in Background Magnetic Field
The interaction of the light with propagating axial torsion fields in the
presence of an external magnetic field has been investigated. Axial torsion
fields appearing in higher derivative quantum gravity possess two states, with
spin one and zero, with different masses. The torsion field with spin-0 state
is a ghost that can be removed if its mass is infinite. We investigate the
possibility when the light mixes with the torsion fields resulting in the
effect of vacuum birefringence and dichroism. The expressions for ellipticity
and the rotation of light polarization axis depending on the coupling constant
and the external magnetic field have been obtained.Comment: 12 pages, title changed, shortened journal version, accepted in
Eur.Phys.J.
Phase diagram of Nambu-Jona-Lasinio model with dimensional regularization
We investigate the phase diagram on temperature-chemical potential plane in
the Nambu-Jona-Lasinio model with the dimensional regularization. While the
structure of the resulting diagram shows resemblance to the one in the
frequently used cutoff regularization, some results of our study indicate
striking difference between these regularizations. The diagram in the
dimensional regularization exhibits strong tendency of the first order phase
transition.Comment: 9 pages, 9 figure
Method for loading cargo trucks using two-dimensional packing algorithms
The paper describes the method for optimization of loading cargo trucks using two-dimensional packing algorithms. The point of this method is to reduce loading cargo problem to two-dimensional packing problem. This problem can be solved by using of various algorithms. There is analysis of several algorithms that are most often used in practical calculations of objects distribution in 2D space in this paper. The object of this study is transport of the metal processing company and its products (cargo). PHP programming language, MySQL database, and Apache web server are used to create client application. The interface developed using HTML5, CSS and javascript. © 2019 IOP Publishing Ltd. All rights reserved.The work was supported by Act 211 Government of the Russian Federation, contract № 02.A03.21.0006
Charge Radii and Magnetic Polarizabilities of the Rho and K* Mesons in QCD String Theory
The effective action for light mesons in the external uniform static
electromagnetic fields was obtained on the basis of QCD string theory. We imply
that in the presence of light quarks the area law of the Wilson loop integral
is valid. The approximation of the Nambu-Goto straight-line string is used to
simplify the problem. The Coulomb-like short-range contribution which goes from
one-gluon exchange is also neglected. We do not take into account spin-orbital
and spin-spin interactions of quarks and observe the and mesons.
The wave function of the meson ground state is the Airy function. Using the
virial theorem we estimate the mean charge radii of mesons in terms of the
string tension and the Airy function zero. On the basis of the perturbative
theory, in the small external magnetic field we find the diamagnetic
polarizabilities of and mesons: , Comment: 22 pages, no figures, in LaTeX 2.09, typos correcte
Coulomb's law modification in nonlinear and in noncommutative electrodynamics
We study the lowest-order modifications of the static potential for
Born-Infeld electrodynamics and for the -expanded version of the
noncommutative U(1) gauge theory, within the framework of the gauge-invariant
but path-dependent variables formalism. The calculation shows a long-range
correction (-type) to the Coulomb potential in Born-Infeld
electrodynamics. However, the Coulomb nature of the potential (to order )
is preserved in noncommutative electrodynamics.Comment: 14 pages, 1 figur
Recent Results From the EU POF-PLUS Project: Multi-Gigabit Transmission Over 1 mm Core Diameter Plastic Optical Fibers
Recent activity to achieve multi-gigabit transmission over 1 mm core diameter graded-index and step-index plastic optical fibers for distances up to 50 meters is reported in this paper. By employing a simple intensity-modulated direct-detection system with pulse amplitude or digital multi-tone modulation techniques, low-cost transceivers and easy to install large-core POFs, it is demonstrated that multi-gigabit transmission up to 10 Gbit/s over 1-mm core diameter POF infrastructure is feasible. The results presented in this paper were obtained in the EU FP7 POF-PLUS project, which focused on applications in different scenarios, such as in next-generation in-building residential networks and in datacom applications
On generalized Born--Infeld electrodynamics
The generalized Born--Infeld electrodynamics with two parameters is
investigated. In this model the propagation of a linearly polarized laser beam
in the external transverse magnetic field is considered. It was shown that
there is the effect of vacuum birefringence, and we evaluate induced
ellipticity. The upper bounds on the combination of parameters introduced from
the experimental data of BRST and PVLAS Collaborations were obtained. When two
parameters are equal to each other, we arrive at Born--Infeld electrodynamics
and the effect of vacuum birefringence vanishes. We find the canonical and
symmetrical Belinfante energy-momentum tensors. The trace of the
energy-momentum tensor is not zero and the dilatation symmetry is broken. The
four-divergence of the dilatation current is equal to the trace of the
Belinfante energy-momentum tensor and is proportional to the parameter (with
the dimension of the field strength) of the model. The dual symmetry is also
broken in the model considered.Comment: 13 pages, minor corrections, published versio
Stabilized vortex solitons in layered Kerr media
In this letter we demonstrate the possibility of stabilizing beams with
angular momentum propagating in Kerr media. Large propagation distances without
filamentation can be achieved in layered media with alternating focusing and
defocusing nonlinearities. Stronger stabilization can be obtained with the
addition of an incoherent beam.Comment: 4 pages, 3 figures. We have removed the sentence "Thus, they
erroneously point out to the existence of fully stabilized vortex solitons"
in page 2, column 2, line 7-8, because it might be confusin
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