V. V. Borzov, E. V. Damaskinsky
We discuss the construction of oscillator-like systems associated with orthogonal polynomials on the example of the Fibonacci oscillator. In addition, we consider the dimension of the corresponding lie algebras.
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A new deformed canonical commutation relation, generalizing various known deformations, is defined together with its structure function of deformation. Then, the related irreducible representations are characterized and classified. Finally, the discrete spectrum of the corresponding deformed harmonic oscillator Hamiltonian is investigated and discussed.
The polynomial algebra is a deformed SU(2) algebra. Here, we use polynomial algebra as a method to solve a series of deformed oscillators. Meanwhile, we find a series of physics systems corresponding with polynomial algebra with different maximal order.
Two oscillators quantum groups and associated deformed coherent states
从两个独立振子群的一个忠实的五维矩阵表示出发，利用R-矩阵方法，构造了几类变形的费米子-玻色子量子Hopf代数.相应的李变形超代数的类型I-II，通过对偶得到的计算和实现的生成元的这些变形超代数给出了在通常的费米和玻色子的创建和湮灭运营商的超对称谐振子。在此基础上，构造了广义变形零化子，并计算了它们的本征态，得到了一类新的变形相干态。
Unified $(q;α,β,γ;ν)$-deformation of one-parametric q-deformed oscillator algebras
定义了广义$(q;α,β,γ;ν)$ -变形振子代数，并研究了它的特征数.我们描述了变形的结构函数，分析了不可约表示的分类，讨论了哈密顿量的渐近谱行为。对于变形参数的特殊选择，我们构造了具有“量子化坐标”算符的离散谱的变形振子。我们建立其与（广义）离散埃尔米特多项式。
Unified description of q-deformed harmonic oscillators
本文证明了包括Macfarlane型谐振子和Dubna型谐振子在内的一大类q变形谐振子可以统一描述。假设振子的哈密顿量由q-变形梯形算子的q-变形反换位子给出。通过求解$q$ -差分方程，导出了阶梯算子和波函数的坐标表示，得到了$q$ -Hermite函数的统一参数表示以及Macfarlane型和Dubna型振子的相关公式.除了已知的具有全局周期结构的解之外，还存在无穷多个具有全局非周期结构的解。
Generalized q-deformed oscillators, q-Hermite polynomials, generalized coherent states
本文的目的是研究著名的q-变形谐振子的广义q-类似物，并将它们与q-厄米多项式联系起来。我们给出了相应的仿射代数的构造，并证明了相应的Hermite多项式是离散的q-Hermite I和离散的q-Hermite II多项式的推广.我们还构造了与这些多项式相关联的类混沌系统的Barut-Girardello型广义相干态。
The Liouville equation for the q-deformed 1-D classical harmonic oscillator is derived for two definitions of q-deformation. This derivation is achieved by using two different representations for the q-deformed Hamiltonian of this oscillator corresponding to undeformed and deformed phase spaces. The resulting Liouville equation is solved by using the method of characteristics in order to obtain the classical probability distribution function for this system. The 2-D and 3-D behaviors of this function are then investigated using a computer visualization method. The results are compared with tho…
In this paper, we present an explicit realization of q-deformed Calogero-Vasiliev algebra whose generators are first-order q-difference operators related to the generalized discrete q-Hermite II polynomials recently introduced in [13]. Furthermore, we construct the wave functions and we determine the q-coherent states.
The aim of this paper is to review our results on description of the multi-parameter deformed oscillators and their oscillator algebras. We define generalized (q;α,β,γ;ν)-deformed oscillator algebra and study its irreducible representations. The Arik-Coon oscillator with the main relation aa^+ - q a^+a = 1, where q > 1 is embedded in this framework. We find connection of this oscillator with the Askey (1/q)-Hermite polynomials. We construct family of the generalized coherent states associated with these polynomials and give their explicit expression in terms of standard special functions. By m…
In this paper, we propose a full characterization of a generalized $q-$deformed Tamm-Dancoff oscillator algebra and investigate its main mathematical and physical properties. Specifically, we study its various representations and find the condition satisfied by the deformed $q-$number to define the algebra structure function. Particular Fock spaces involving finite and infinite dimensions are examined. A deformed calculus is performed as well as a coordinate realization for this algebra. A relevant example is exhibited. Associated coherent states are constructed. Finally, some thermodynamics a…
kappa-Deformed Oscillators: Deformed Multiplication Versus Deformed Flip Operator and Multiparticle Clusters
本文将文献[1]、[2]中提出的具有kappa变形乘法规则的振子代数转化为具有kappa变形翻转算子和标准乘法的振子代数。我们记得，卡帕振荡器的卡帕乘法使它们脱离壳层。我们研究了修正的质量壳条件的显式形式，在这两个公式：与卡帕乘法和卡帕翻转操作。以卡帕变形的2粒子态为例，研究了卡帕变形的多粒子态的不可因式分解成簇形式。我们认为，卡帕变形的两个自由场的星产品导致以类似的方式到一个nonfactorizable卡帕变形的双局域领域。最后，我们一般性的评论关于卡帕变形的n粒子团和卡帕变形的n场的星积。
We present the most general polynomial Lie algebra generated by a second order integral of motion and one of order M, construct the Casimir operator, and show how the Jacobi identity provides the existence of a realization in terms of deformed oscillator algebra. We also present the classical analog of this construction for the most general Polynomial Poisson algebra. Two specific classes of such polynomial algebras are discussed that include the symmetry algebras observed for various 2D superintegrable systems.
Within the framework of supersymmetric quantum mechanics, we study the simplified version of potential algebra of shape invariance condition in k steps, where k is an arbitrary positive integer. The associated potential algebra is found to be equivalent to the generalized deformed oscillator algebra that has a built-in Z_k-grading structure. The algebraic realization of shape invariance condition in k steps is therefore formulated by the method of Z_k-graded deformed oscillator. Based on this formulation, we explicitly construct the general algebraic properties for shape invariant potentials i…
We analyze systematically several deformations arising from two-dimensional harmonic oscillators which can be described in terms of $\cal{D}$-pseudo bosons. They all give rise to exactly solvable models, described by non self-adjoint hamiltonians whose eigenvalues and eigenvectors can be found adopting the quite general framework of the so-called $\cal{D}$-pseudo bosons. In particular, we show that several models previously introduced in the literature perfectly fit into this scheme.
In this paper, the algebras, representations, and thermostatistics of four types of fermionic q-oscillator models, called fermionic Newton (FN), Chaichian-Kulish-Ng (CKN), Parthasarathy-Viswanathan-Chaichian (PVC), Viswanathan-Parthasarathy-Jagannathan-Chaichian (VPJC), are discussed. Similarities and differences among the properties of these models are revealed. Particular emphasis is given to the VPJC-oscillators model so that its Fock space representation is analyzed in detail. Possible physical applications of these models are concisely pointed out.
The q-Deformed Harmonic Oscillator, Coherent States, and the Uncertainty Relation
对于一个q-变形谐振子，我们发现明确的坐标表示的创建和湮灭运营商，本征函数，相干态（最后被定义为本征态的湮灭运营商）。我们计算了q振子本征态和相干态的坐标动量不确定性的乘积。对于振子，这个乘积在基态最小，等于1/2，就像标准量子力学中一样。对于相干态，$q$ -变形的结果违反了标准的不确定性关系，坐标和momentumoperator的不确定性的产品总是小于1/2。具有最小不确定性的状态（趋于零）对应于接近$q$ -指数收敛半径的$λ$值。
The coherent states for twist-deformed oscillator model provided in article [1] are constructed. Besides, it is demonstrated that the energy spectrum of considered model is labeled by two quantum numbers - by so-called main and azimutal quantum numbers respectively.
A unified method of calculating structure functions from commutation relations of deformed single-mode oscillator algebras is presented. A natural approach to building coherent states associated to deformed algebras is then deduced.
We introduce the most general quartic Poisson algebra generated by a second and a fourth order integral of motion of a 2D superintegrable classical system. We obtain the corresponding quartic (associative) algebra for the quantum analog and we extend Daskaloyannis' construction in obtained in context of quadratic algebras and we obtain the realizations as deformed oscillator algebras for this quartic algebra. We obtain the Casimir operator and discuss how these realizations allow to obtain the finite dimensional unitary irreductible representations of quartic algebras and obtain algebraically …
We extend the construction of 2D superintegrable Hamiltonians with separation of variables in spherical coordinates using combinations of shift, ladder, and supercharge operators to models involving rational extensions of the two-parameter Lissajous systems on the sphere. These new families of superintegrable systems with integrals of arbitrary order are connected with Jacobi exceptional orthogonal polynomials (EOP) of type I (or II) and supersymmetric quantum mechanics (SUSYQM). Moreover, we present an algebraic derivation of the degenerate energy spectrum for the one- and two-parameter Lissa…
We associate with each simple Lie algebra a system of second-order differential equations invariant under a non-compact real form of the corresponding Lie group. In the limit of a contraction to a Schrödinger algebra, these equations reduce to a system of ordinary harmonic oscillators. We provide two clarifying examples of such deformed oscillators: one system invariant under SO(2,3) transformations, and another system featuring $G_{2(2)}$ symmetry. The construction of invariant actions requires adding semi-dynamical degrees of freedom; we illustrate the algorithm with the two examples mention…
A non-Hermitian generalized oscillator model, generally known as the Swanson model, has been studied in the framework of R-deformed Heisenberg algebra. The non-Hermitian Hamiltonian is diagonalized by generalized Bogoliubov transformation. A set of deformed creation annihilation operators is introduced whose algebra shows that the transformed Hamiltonian has conformal symmetry. The spectrum is obtained using algebraic technique. The superconformal structure of the system is also worked out in detail. An anomaly related to the spectrum of the Hermitian counterpart of the non-Hermitian Hamiltoni…
We show that the crossing symmetric dispersion relation (CSDR) for 2-2 scattering leads to a fascinating connection with knot polynomials and q-deformed algebras. In particular, the dispersive kernel can be identified naturally in terms of the generating function for the Alexander polynomials corresponding to the torus knot $(2,2n+1)$ arising in knot theory. Certain linear combinations of the low energy expansion coefficients of the amplitude can be bounded in terms of knot invariants. Pion S-matrix bootstrap data respects the analytic bounds so obtained. We correlate the $q$-deformed harmonic…
The formalism for Poisson-Hopf (PH) deformations of Lie-Hamilton systems is refined in one of its crucial points concerning applications, namely the obtention of effective and computationally feasible PH deformed superposition rules for prolonged PH deformations of Lie-Hamilton systems. The two new notions here proposed are a generalization of the standard superposition rules and the concept of diagonal prolongations for Lie systems, which are consistently recovered under the non-deformed limit. Using a technique from superintegrability theory, we obtain a maximal number of functionally indepe…
The Tsallis $q$-exponential function $e_q(x) = (1+(1-q)x)^{\frac{1}{1-q}}$ is found to be associated with the deformed oscillator defined by the relations $\left[N,a^\dagger\right] = a^\dagger$, $[N,a] = -a$, and $\left[a,a^\dagger\right] = ϕ_T(N+1)-ϕ_T(N)$, with $ϕ_T(N) = N/(1+(q-1)(N-1))$. In a Bargmann-like representation of this deformed oscillator the annihilation operator $a$ corresponds to a deformed derivative with the Tsallis $q$-exponential functions as its eigenfunctions, and the Tsallis $q$-exponential functions become the coherent states of the deformed oscillator. When $q = 2$ th…
The aim of this paper is to provide an explicit expressions for the generalized q-deformed harmonic oscillator coherent states obtained in terms of a weak and strong behavior expansions. We first use the weak (s --> 0) deformed version of q-boson annihilation operator to solve Barut-Girardello's eigenvalues coherent states equation for the generalized q-deformed harmonic oscillator. In strong behavior limit (s --> 1) the previous result is resumed using the variational perturbation theory. We also describe the construction of their resolution of unity.
For the two-parameter $p,q$-deformed Heisenberg algebra introduced recently and in which, instead of usual commutator of $X$ and $P$ in the l.h.s. of basic relation $[X,P] = {\rm i}\hbar$, one uses the $p,q$-commutator, we established interesting properties. Most important is the realizability of the $p,q$-deformed Heisenberg algebra by means of the appropriate deformed oscillator algebra. Another uncovered property is special extension of the usual mutual Hermitian conjugation of the creation and annihilation operators, namely the so-called $η(N)$-pseudo-Hermitian conjugation rule, along with…
q-Deformed Orthogonal and Pseudo-Orthogonal Algebras and Their Representations
构造了变形正交和伪正交李代数，它们在Cartan子代数和根向量方面不同于李代数的变形，并使按Gel'fand-Tsetlin型公式作用的算子构造表示成为可能.找到了q-变形代数U_q（so_{n,1}）的酉表示.
We derive and spell out the structure constants of the $\mathbb{Z}_2$-graded algebra $\mathfrak{shs}[λ]\,$ by using deformed-oscillators techniques in $Aq(2;ν)\,$, the universal enveloping algebra of the Wigner-deformed Heisenberg algebra in 2 dimensions. The use of Weyl ordering of the deformed oscillators is made throughout the paper, via the symbols of the operators and the corresponding associative, non-commutative star product. The deformed oscillator construction was used by Vasiliev in order to construct the higher spin algebras in three spacetime dimensions. We derive an expression for…
Calogero Model(s) and Deformed Oscillators
我们简要地回顾了最近的一些结果有关代数（振荡器）方面的$N$体单物种和多物种Calogero模型在一维。我们展示了这些模型是如何从谐振子哈密顿量的矩阵推广中出现的。我们对这些模型的可解性作了一些评论。
This work addresses a $θ(\hat{x},\hat{p})-$deformation of the harmonic oscillator in a $2D-$phase space. Specifically, it concerns a quantum mechanics of the harmonic oscillator based on a noncanonical commutation relation depending on the phase space coordinates. A reformulation of this deformation is considered in terms of a $q-$deformation allowing to easily deduce the energy spectrum of the induced deformed harmonic oscillator. Then, it is proved that the deformed position and momentum operators admit a one-parameter family of self-adjoint extensions. These operators engender new families …
Irreducibility and Compositeness in q-Deformed Harmonic Oscillator Algebras
利用Gauss提出的数概念的一个推广，即Q数，讨论了变形参数的实值和单位根值的q变形谐振子代数.本文研究了Fock空间表示的约简，探讨了高斯多项式的性质。当变形参数为单位单位根时，根据变形参数的本原性和非本原性的分类，给出了一种空间表示的归约方案。应用进行了q-变形谐振子哈密顿量，其中的约化方案是明确适用。对于有限维非原根单位空间，讨论了k-费米子/量子的复合性.
The quantum oscillator and Kepler-Coulomb problems in $d$-dimensional spaces with constant curvature are analyzed from several viewpoints. In a deformed supersymmetric framework, the corresponding nonlinear potentials are shown to exhibit a deformed shape invariance property. By using the point canonical transformation method, the two deformed Schrödinger equations are mapped onto conventional ones corresponding to some shape-invariant potentials, whose rational extensions are well known. The inverse point canonical transformations then provide some rational extensions of the oscillator and Ke…
Deformed Heisenberg algebras, a Fock-space representation and the Calogero model
我们描述一维一般变形海森堡代数。得到了广义莱布尼兹规则成立的条件，并求解了该条件.我们分析的条件下，变形量子力学问题有一个福克空间表示。这些条件的一个解导致了Lorek等人已经研究过的q变形振子，而只在无限动量系中才退化为谐振子。另一种解在普通的量子力学中导出了Calogero模型，但在没有形变的情况下简化为谐振子。
Interpolating statistics realized as Deformed Harmonic Oscillators
服从内插统计量的系统可以用变形振子代数来描述的思想一直是一个突出的问题。格林伯格很久以前提出的这个原始概念是这次调查的动机。我们建立了一个q-变形代数可以用来描述粒子（任意子）的统计连续插入玻色和费米统计之间，即，分数统计我们发现，广义中间统计分裂成玻色子和费米子的制度，每个描述了一个独特的振子代数。B-任意子的热统计是用基于Jackson导数的q-演算来描述的，而F-任意子是用热力学的普通导数来描述的。我们确定并研究了B-任意子和F-任意子的热力学函数。
The symmetry structure of twodimensional nonlinear isotropic oscillator, introduced in Physica D237 (2008) 505, is discussed. It is shown that it possesses three independent integrals of motion which can be chosen in such a way that they span SU(2), E(2) or SU(1,1) algebras, depending on the value of total energy. They generate the infinitesimal canonical symmetry transformations; integrability of the latter is analyzed. The results are then generalized to the case of arbitrary number of degrees of freedom.
The Lie algebra $\mathfrak{su}(1,1)$ can be deformed by a reflection operator, in such a way that the positive discrete series representations of $\mathfrak{su}(1,1)$ can be extended to representations of this deformed algebra $\mathfrak{su}(1,1)_γ$. Just as the positive discrete series representations of $\mathfrak{su}(1,1)$ can be used to model a quantum oscillator with Meixner-Pollaczek polynomials as wave functions, the corresponding representations of $\mathfrak{su}(1,1)_γ$ can be utilized to construct models of a quantum oscillator. In this case, the wave functions are expressed in terms…
We present the quadratic algebra of the generalized MICZ-Kepler system in three-dimensional Euclidean space $E_{3}$ and its dual the four dimensional singular oscillator in four-dimensional Euclidean space $E_{4}$. We present their realization in terms of a deformed oscillator algebra using the Daskaloyannis construction. The structure constants are in these cases function not only of the Hamiltonian but also of other integrals commuting with all generators of the quadratic algebra. We also present a new algebraic derivation of the energy spectrum of the MICZ-Kepler system on the three sphere …
We define a new algebra, which can formally be considered as a ${\cal C}{\cal P}$ deformed $\mathfrak{su}(2)$ Lie algebra. Then, we present a one-dimensional quantum oscillator model, of which the wavefunctions of even and odd states are expressed by Krawtchouk polynomials with fixed $p=1/2$, $K_{2n}(k;1/2,2j)$ and $K_{2n}(k-1;1/2,2j-2)$. The dynamical symmetry of the model is the newly introduced $\mathfrak{su}(2)_{{\cal C}{\cal P}}$ algebra. The model itself gives rise to a finite and discrete spectrum for all physical operators (such as position and momentum). Among the set of finite oscill…
The SL(2,R)WZWN string model as a deformed oscillator and its classical-quantum string regimes
我们研究了描述AdS_3时空中玻色弦论的SL（2，R）WZWN弦模型及其质量谱和弦修正的SL（2，R）测不准关系。SL（2，R）弦振子比未变形的弦振子更量子化（具有更高的量子不确定性）和更受激发。这是伴随着高激发的弦质谱，这是急剧变化的相对于低激发的。描述了SL（2，R）弦模型的高激发态量子弦区和低激发态半经典区，并证明了它们在通常的经典-量子对偶的精确意义上是彼此的量子-经典对偶。这种经典-量子实现既不是假设的，也不是证明的。量子态（高曲率）表现出修改后的海森堡测不准关系，而经典态（低曲率）则具有通常的量子力学不确定原理。
Inspired by a recently proposed Duality and Conformal invariant modification of Maxwell theory (ModMax), we construct a one-parameter family of two-dimensional dynamical system in classical mechanics that share many features with the ModMax theory. It consists of a couple of $\sqrt{T\bar{T}}$-deformed oscillators that nevertheless preserves duality $(q \rightarrow p,p \rightarrow -q)$ and depends on a continuous parameter $γ$, as in the ModMax case. Despite its non-linear features, the system is integrable. Remarkably can be interpreted as a pair of two coupled oscillators whose frequencies de…
Matrix-valued $θ$-deformed bi-orthogonal polynomials, Non-commutative Toda theory and Bäcklund transformation
本文研究矩阵值 θ-变形双正交多项式与非交换 Toda 型层级的关系，利用 Wronski 拟行列式作为非交换 τ-函数，并通过矩修改方法实现 Bäcklund 变换，得到包含已知格方程的非交换 θ-变形 Volterra 层级。
We investigate the dynamical symmetry superalgebras of the one-dimensional Matrix Superconformal Quantum Mechanics with inverse-square potential. They act as spectrum-generating superalgebras for the systems with the addition of the de Alfaro-Fubini-Furlan oscillator term. The undeformed quantum oscillators are expressed by $2^n\times 2^n$ supermatrices; their corresponding spectrum-generating superalgebras are given by the $osp(2n|2)$ series. For $n=1$ the addition of a inverse-square potential does not break the $osp(2|2)$ spectrum-generating superalgebra. For $n=2$ two cases of inverse-squa…
We give explicit analytical expressions for the partition function of $U(N)_{k}\times U(N+M)_{-k}$ ABJ theory at weak coupling ($k\rightarrow \infty )$ for finite and arbitrary values of $N$ and $M$ (including the ABJM case and its mass-deformed generalization). We obtain the expressions by identifying the one-matrix model formulation with a Meixner-Pollaczek ensemble and using the corresponding orthogonal polynomials, which are also eigenfunctions of a $su(1,1)$ quantum oscillator. Wilson loops in mass-deformed ABJM are also studied in the same limit and interpreted in terms of $su(1,1)$ cohe…
The Wigner function of a q-deformed harmonic oscillator model
构造了q变形量子谐振子模型的相空间表示。我们已经找到了明确的表达式的Wigner和Husimi分布函数的定态的$q$振荡器模型正在考虑中。维格纳函数表示为一个基本的超几何级数，与Al-Salam-Chihara多项式有关。它表明，在极限情况下，$h \to 0$（$q \to 1$），维格纳和胡西米分布函数正确地减少到他们著名的非相对论类似物。令人惊讶的是，在q变形模型中的两个分布函数的检查表明，当$q \ll 1$时，它们在相空间中的行为类似于普通量子振荡器的基态，但具有朝向动量负值的位移。我们还计算了平均值的位置和动量使用维格纳函数。与普通情况不同，动量的平均值不是零，它取决于$q$和$n$。在q-形变模型中，激发态的分布函数具有类似基态的行为，这为进一步在相空间中对量子系统进行实验测量开辟了新的前景。
We demonstrate that dynamical noncommutative space-time will give rise to deformed oscillator algebras. In turn, starting from some q-deformations of these algebras in a two dimensional space for which the entire deformed Fock space can be constructed explicitly, we derive the commutation relations for the dynamical variables in noncommutative space-time. We compute minimal areas resulting from these relations, i.e. finitely extended regions for which it is impossible to resolve any substructure in form of measurable knowledge. The size of the regions we find is determined by the noncommutativ…
The concept of quasi-bosons or composite bosons (like mesons, excitons etc.) has a wide range of potential physical applications. Even composed of two pure fermions, the quasi-boson creation and annihilation operators satisfy non-standard commutation relations. It is natural to try to realize the quasi-boson operators by the operators of deformed (nonlinear) oscillator, the latter constituting widely studied field of modern quantum physics. In this paper, it is proved that the deformed oscillators which realize quasi-boson operators in a consistent way really exist. The conditions for such rea…
A family of multi-parameter, polynomially deformed oscillators (PDOs) given by polynomial structure function ϕ(n) is studied from the viewpoint of being (or not) in the class of Fibonacci oscillators. These obey the Fibonacci relation/property (FR/FP) meaning that the n-th level energy E_n is given linearly, with real coefficients, by the two preceding ones E_{n-1}, E_{n-2}. We first prove that the PDOs do not fall in the Fibonacci class. Then, three different paths of generalizing the usual FP are developed for these oscillators: we prove that the PDOs satisfy respective k-term generalized Fi…
Deformed Harmonic Oscillators for Metal Clusters: Analytic Properties and Supershells
本文讨论了在原子核结构中首次引入的Nilsson修正振子（MO）和最近引入的基于量子代数技术的三维q变形谐振子的解析性质（3-dimq-HO）具有Uq（3）> SOq（3）对称性，已知它仅用一个参数就能正确地再现高达1500的碱金属簇的幻数（预期的有效性限制的理论的基础上填充的电子壳），被认为是。给出了封闭壳总能量的精确表达式，并进行了比较。此外，超壳层的出现在两个振子的光谱中的系统学被认为是，表明3-dim q-HO正确地预测在碱金属团簇中的第一个超壳层的关闭，而不使用任何额外的参数。
Fractional supersymmetric quantum mechanics, topological invariants and generalized deformed oscillator algebras
利用广义变形振子代数的生成元实现了$λ$阶分数超对称量子力学，并在后者的Fock空间上施加了Z $_λ$ -分次结构.这种实现被证明是完全可约的不可约组件提供$λ$套最小玻色化运营商对应的未破碎和破碎的情况下。给出了Z $_λ$ -分次（1，1，.）型一致拓扑对称的一些例子，1)用拓扑不变量推广Witten指数。
We present the deformed (for the presence of Calogero potential terms) one-dimensional quantum oscillator with the exceptional Lie superalgebra $F(4)$ as spectrum-generating superconformal algebra. The Hilbert space is given by a $16$-ple of square-integrable functions. The energy levels are $\frac{2}{3}+n$, with $n=0,1,2,\ldots$. The ground state is $7$ times degenerate. The excited states are $8$ times degenerate. The $(7,8,8,8,\ldots )$ semi-infinite tower of states is recovered from the $(7;8;1)$ supermultiplet of the ${\cal N}=8$ worldline supersymmetry. The model is unique, up to similar…
We consider the unital associative algebra $\mathcal{A}$ with two generators $\mathcal{X}$, $\mathcal{Z}$ obeying the defining relation $[\mathcal{Z},\mathcal{X}]=\mathcal{Z}^2+Δ$. We construct irreducible tridiagonal representations of $\mathcal{A}$. Depending on the value of the parameter $Δ$, these representations are associated to the Jacobi matrices of the para-Krawtchouk, continuous Hahn, Hahn or Jacobi polynomials.
Deformed Oscillators with Two Double (Pairwise) Degeneracies of Energy Levels
提出了一种方案，它允许获得特殊的$q$ -振荡器模型，其特征在于在拥有两个不同对的简并能级。该方法采用双参数变形$q,p$振子模型，通过适当选择$p$和$q$之间的特殊关系进行求解。对于包含两个退化对$E_1=E_2$和$E_3=E_4$的情况，使用了不同版本的二次关系$p=f(q)$。另一方面，利用一个固定的二次关系，我们得到了两对（成对）简并能级的$p$ -振子。
We point out a misleading treatment in a recent paper published in this Journal [Eur. Phys. J. C (2018)78:106] regarding solutions for the Schrödinger equation with a anharmonic oscillator potential embedded in the background of a cosmic string mapped into biconfluent Heun equation. This fact jeopardizes the thermodynamical properties calculated in this system.
We construct exact eigenvectors and eigenvalues for $U_q(\mathfrak{sp}_{2n})$- and $U_q(\mathfrak{so}_{2n})$-symmetric closed spin chains by means of a nested algebraic Bethe ansatz method. We use a fusion procedure to construct higher-dimensional Lax operators. Our approach generalises and extends the results obtained by Reshetikhin and De Vega-Karowski. We also present a generalisation of Tarasov-Varchenko trace formula for nested Bethe vectors.
We prove orthogonality and compute explicitly the (quadratic) norms for super-Jack polynomials $SP_λ((z_1,\ldots,z_n),(w_1,\ldots,w_m);θ)$ with respect to a natural positive semi-definite, but degenerate, Hermitian product $\langle\cdot,\cdot\rangle_{n,m}^\prime$. In case $m=0$ (or $n=0$), our product reduces to Macdonald's well-known inner product $\langle\cdot,\cdot\rangle_n^\prime$, and we recover his corresponding orthogonality results for the Jack polynomials $P_λ((z_1,\ldots,z_n);θ)$. From our main results, we readily infer that the kernel of $\langle\cdot,\cdot\rangle_{n,m}^\prime$ is s…
Composite bosons, here called {\it quasibosons} (e.g. mesons, excitons, etc.), occur in various physical situations. Quasibosons differ from bosons or fermions as their creation and annihilation operators obey non-standard commutation relations, even for the "fermion+fermion" composites. Our aim is to realize the operator algebra of quasibosons composed of two fermions or two q-fermions (q-deformed fermions) by the respective operators of deformed oscillators, the widely studied objects. For this, the restrictions on quasiboson creation/annihilation operators and on the deformed oscillator (de…
Lorentz-covariant deformed algebra with minimal length and application to the 1+1-dimensional Dirac oscillator
将Kempf引入的$D$ -维$(β, β')$ -双参数变形代数推广到描述（$D+1$）-维量子化时空的Lorentz-协变代数.在D=3和$β=0$的情况下，后者再现了Snyder代数。变形庞加莱变换离开代数不变的标识。它表明，存在一个非零的最小不确定性的位置（最小长度）。在$β'=0$的情形下，研究了由这种代数描述的1+1维时空中的Dirac振子.将超对称量子力学和形状不变性方法扩展到能量相关的哈密顿量，提供了精确的束缚态能量和波函数。$β< 1/(m^2 c^2)$存在物理上可接受的状态。一个新的有趣的结果是，与传统的狄拉克振荡器相比，能谱是有界的。
Unified description of magic numbers of metal clusters in terms of the 3-dimensional q-deformed harmonic oscillator
用具有Uq（3）>SOq（3）对称性的三维q形变谐振子预言的幻数与碱金属原子团簇的实验数据进行了比较（Li，Na，K，Rb，Cs），贵金属（Cu，Ag，Au），二价金属（Zn，Cd）和三价金属（Al，In），以及凝胶模型，Woods-Saxon和酒瓶电势的理论预测，并且涉及使用3 n +1伪量子数的分类方案。在碱金属团簇和贵金属团簇中，三维q变形谐振子正确地预言了实验观测到的所有幻数，直到1500（这是基于电子壳层填充的理论的有效性的预期极限），而另外，它给出了二价金属和三价金属簇的幻数的令人满意的结果，从而表明Uq（3），它是球面（3维各向同性）谐振子的U（3）对称性的非线性扩展，是几个金属团簇系统对称性的良好候选者。与三维q变形谐振子近似产生相同频谱的角动量相关势的泰勒展开式被发现与对称化Woods-Saxon势和酒瓶对称化Woods-Saxon势的泰勒展开式相似，已知它们提供了Ekardt势的成功拟合。
We consider the deformed harmonic oscillator as a discrete version of the Liouville theory and study this model in the presence of local integrable defects. From this, the time evolution of the defect degrees of freedom are determined, found in the form of the local equations of motion. We also revisit the continuous Liouville theory, deriving its local integrals of motion and comparing these with previous results from the sine-Gordon point of view.Finally, the generic Backlund type relations are presented, corresponding to the implementation of time-like and space-like impurities in the conti…
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