Searcharxiv⌕ Search

arXiv subjects

E. V. Damaskinsky

Publications and source records attributed to E. V. Damaskinsky.

26 records · Page 2Linked to original sources
arXiv1998

On position operator spectral measure for deformed oscillator in the case of indetermine Hamburger moment problem

The spectral measure of the position (momentum) operator $X$ for $q$-deformed oscillator is calculated in the case of the indetermine Hamburger moment problem. The exposition is given for concrete choice of generators for $q$-oscillator algebra, although developed technique apply for every other cases with indetermine moment problem. The Stieltjes transformation $m(z)$ of spectral measure is expressed in terms of the entries of Jacobi matrix $X$ only. The direct connection between values of parameters labeling the spectral measures and related selfadjoint extensions of $X$ is established.

math.QA↗
arXiv1997

Dynamical systems related to the Cremmer-Gervais R-matrix

The generalized Cremmer-Gervais R-matrix being a twist of the standard R-matrix of $SL_q(3)$, depends on two extra parameters. Properties of this R-matrix are discussed and two dynamical systems, the quantum group covariant $q$-oscillator and an integrable spin chain with a non-hermitian Hamiltonian, are constructed.

q-alg↗
arXiv1996

Irreducible representations of deformed oscillator algebra and q-special functions

Different generators of a deformed oscillator algebra give rise to one-parameter families of $q$-exponential functions and $q$-Hermite polynomials related by generating functions. Connections of the Stieltjes and Hamburger classical moment problems with the corresponding resolution of unity for the $q$-coherent states and with 'coordinate' operators - Jacobi matrices, are also pointed out.

q-alg↗
arXiv1995

Gauss Decomposition for Quantum Groups and Supergroups

The Gauss decompositions of the quantum groups, related to classical Lie groups and supergroups are considered by the elementary algebraic and $R$-matrix methods. The commutation relations between new basis generators (which are introduced by the decomposition) are described in some details. It is shown that the reduction of the independent generator number in the new basis to the dimension of related classical (super) group is possible. The classical expression for (super) determinant through the Gauss decomposition generators is not changed in the deformed case. The symplectic quantum group $Sp_q(2)$ and supergroups $GL_q(1|1), GL_q(2|1)$ are considered as examples.

q-alg↗
arXiv1995

Quantum Groups,Deformed Oscillators and their Interrelations

The main notions of the quantum groups: coproduct, action and coaction, representation and corepresentation are discussed using simplest examples: $GL_q(2)$, $sl_q(2)$, $q$-oscillator algebra ${\cal A}(q)$, and reflection equation algebra. The Gauss decompositions of quantum groups and their realizations in terms of\, ${\cal A}(q)$ are given.

q-alg↗