11,006 research outputs found
Generic super-orbits in gl(m|n)* and their braided counterparts
We introduce some braided varieties -- braided orbits -- by considering
quotients of the so-called Reflection Equation Algebras associated with Hecke
symmetries (i.e. special type solutions of the quantum Yang-Baxter equation).
Such a braided variety is called regular if there exists a projective module on
it, which is a counterpart of the cotangent bundle on a generic orbit O in
gl(m)* in the framework of the Serre approach. We give a criterium of
regularity of a braided orbit in terms of roots of the Cayley-Hamilton identity
valid for the generating matrix of the Reflection Equation Algebra in question.
By specializing our general construction we get super-orbits in gl(m|n)* and a
criterium of their regularity
Gamma Radiation by Neutralino Stars
A new model of gamma radiation (GR) generated by neutralino annihilation in
neutralino stars (NeS) is proposed. Diffuse Galactic and extragalactic GR is
calculated for this model and is shown to be in a reasonable agreement with
observations.
The point source component (P) is picked out among nonidentified discrete
gamma sources from EGRET catalog. This component is shown to be distributed
isotropically and homogeneously, as it should be for NeS. Gamma radiation from
significant part of P-sources is supposed to be the direct radiation from
individual NeS. This supposition is shown to be in agreement with observations.
The comparison of the theory with observed GR gives a possibility to establish
some important features of CDM particle.Comment: 12 pages, LaTe
Braided Differential Operators on Quantum Algebras
We define the braided differential algebras which can be interpreted as
quantization of the differential operator algebra defined on some algebraic
varieties supplied with the action of the group GL(m). The algebra is generated
by right invariant or coajoint vector fields. Our main example is gl^*(m) and
coadjoint orbits in it. The Heisenberg double on the quantum group
Fun_q(GL(m)is a particular case of the suggested construction.Comment: Corrected and extended version. An illustrative example is added into
the Section 5. LaTex file, 24 pp. Accepted for publication in "Journal of
Geometry and Physics
Double quantization of \cp type orbits by generalized Verma modules
It is known that symmetric orbits in for any simple Lie algebra
are equiped with a Poisson pencil generated by the
Kirillov-Kostant-Souriau bracket and the reduced Sklyanin bracket associated to
the "canonical" R-matrix. We realize quantization of this Poisson pencil on
\cp type orbits (i.e. orbits in whose real compact form is ) by means of q-deformed Verma modules.Comment: 21 pages, LaTeX, no figure
On Whitham theory for perturbed integrable equations
Whitham theory of modulations is developed for periodic waves described by
nonlinear wave equations integrable by the inverse scattering transform method
associated with matrix or second order scalar spectral problems. The
theory is illustrated by derivation of the Whitham equations for perturbed
Korteweg-de Vries equation and nonlinear Schr\"odinger equation with linear
damping.Comment: 17 pages, no figure
Braided Weyl algebras and differential calculus on U(u(2))
On any Reflection Equation algebra corresponding to a skew-invertible Hecke
symmetry (i.e. a special type solution of the Quantum Yang-Baxter Equation) we
define analogs of the partial derivatives. Together with elements of the
initial Reflection Equation algebra they generate a "braided analog" of the
Weyl algebra. When , the braided Weyl algebra corresponding to the
Quantum Group goes to the Weyl algebra defined on the algebra
\Sym((u(2)) or that depending on the way of passing to the limit.
Thus, we define partial derivatives on the algebra , find their
"eigenfunctions", and introduce an analog of the Laplace operator on this
algebra. Also, we define the "radial part" of this operator, express it in
terms of "quantum eigenvalues", and sketch an analog of the de Rham complex on
the algebra . Eventual applications of our approach are discussed.Comment: LaTex, 18 pages. Accepted in Journal of Geometry and Physic
Experimental Evidence of Giant Electron - Gamma Bursts Generated by Extensive Atmospheric Showers in Thunderclouds
The existence of a new phenomena - giant electron-gamma bursts is
established. The bursts are generated in thunderclouds as a result of the
combined action of runaway breakdown and extensive atmosphere showers (RB-EAS).
The experiments were fulfilled at the Tien Shan Mountain Scientific Station
using EAS-Radio installation. This specially constructed installation consists
of a wide spread EAS trigger array and a high time resolution
radiointerferometer.Comment: 30 pages, 16 figure
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