非谐振子Gazeau-Klauder与Klauder-Perelomov相干态

利用Kinani-Daoud方法构造了非谐振子势的Gazeau-Klauder(GK)相干态和Klauder-Perelomov(KP)相干态，表明两种相干态在非线性谐振子势下具有完全不同的形式，并对两种相干态的完备性以及各自构成的Hilbert空间进行了讨论. 对相干态的Mandel Q参数的研究表明：GK相干态服从亚Poisson统计分布，KP相干态服从超Poisson统计分布.     

李超代数OSP（1,2）的两分量相干态表示

本文构造了李超代数ＯＳＰ（１，２）的一种新的相干态－－两分量相干态。这种两分量相干态形成ＯＳＰ（１，２）代数的一种新表示。获得了ＯＳＰ（１，２）代数的一种非齐次微分实现。分析了这种新相干态的压缩性质。发现ＯＳＰ（１，２）代数的奇生成元可以改变这种两分量相干态的压缩性质。     

一类量子态的迹距离相干度量的最优化证明方法

迹距离相干度量是基于迹范数提出的量化相干的一种度量.然而,很难给出一般量子态迹距离相干度量的表达式并且找到对应的最近非相干态.通过最优化方法给出了一类d×d量子态的迹距离相干度量,并且证明了这类量子态的最近非相干态就是由该量子态去掉所有非对角元素得到的对角矩阵.     

形变谐振子相干态及其对SUq（3）的应用

该文讨论了形变诺振子相干态的一些有意义的性质，利用量子代数SUq（3）的形变谐振子实现，构造了SU3（q）在玻色、费米两种情况下的相干态．     

关于相干态的若干新应用

本文把量子场论中算符的正规乘积应用于相干态。利用正规乘积下的积分方法可以简捷地导出一系列新的量子算符公式、某些著名的么正变换和泛函积分的转换矩阵元、给出了Wigner算符的显示形式和相干态形式,并由此分别就玻色、费米两种情况证明了Weyl对应的实质是相干态对应,其中费米子Weyl对应和Wigner算符是根据费米子相干态的理论给出的,由它可以进一步导出无边界项的费米子泛函积分、母泛函、费米子Wigner定理和Moyal括号,从而建立了费米系统量子力学及其赝经典对应的理论。     

量子孤子的噪声极限及准相干态

基于量子非线性SchrÖdinger方程的严格解和量子孤子态的定义,分析了光孤子的量子噪声,得出其局域粒子数和正交位相分量的噪声的最低极限,证明其不可能低于相干态下相应值,即对基孤子态该力学量的起伏不可能被压缩.还进一步表明,局域粒子数和正交位相分量取最低噪声的态均为准孤子相干态,在该态下量子孤子的波包扩散和相位扩散效应可以忽略.     

一类复杂Feynman转换矩阵元的计算

本文利用相干态的性质把相互作用表象中演化算符所满足的方程化为相干态对应c数方程,并用正规乘积内积分法求出了平方型含时外源和线性含时外源共存时的谐振子Feynman转换矩阵元的一般形式。     

一般线性Lie超代数的微分算子表示

对一般线性Lie超代数的Verma模及向量相干态(vector-coherent-states)表示给出了以向量为系数的微分算子实现.对一般线性Lie超代数的单一非典型(singlyatypical)Kac模,我们具体写出了本原权向量,并对这种情形确切写出了用以刻画向量相干态表示的单子表示的微分方程.     

负度规量子力学的坐标、动量表象

本文在文献[1,2]的基础上继续探讨负度规量子力学的表象理论。利用负度规玻色子相干态的性质和正规乘积的性质,首先导出了度规算符的正规乘积形式,进而讨论了坐标、动量算符的虚数本征值的本征态,利用相干态方法证明了它们是不可归一的.但是可以找到“类度规算符”使得它们的δ函数归一化可以实现。还给出了虚值本征态所满足的完备性关系及其与实本征态之间的关系,最后给出了物理态真空在新表象中的表示。     

B-函数在李超代数相干态表示中的应用

给出了 B(n +1 ,m -n -1 )函数在李超代数相干态表示中的应用     

Representation of exact and semiclassical eigenfunctions via coherent states. Hydrogen atom in a magnetic field

Global formulas for eigenfunctions and solutions to the Cauchy problem, including the path integral representation, are obtained using the coherent states technique. The reduction of coherent states via symmetry groups is studied for a transformation from Bessel to hypergeometric states. The eigenfunctions of the Hamiltonian for the hydrogen atom in a homogeneous magnetic field are expressed in terms of Bessel coherent states. For a small field, after quantum averaging, the Hamiltonian is represented in terms of generators with quadratic commutation relations. The irreducible representations of this quadratic algebra are realized on hypergeometric states. The notion of deformed hypergeometric states is also introduced for this quadratic algebra as an analog of squeezed Gaussian packets of the Heisenberg algebra. The asymptotic equations of eigenfunctions with respect to a small field and a large leading quantum number are derived using these states and their deaveraging. Some explicit formulas for the Zeeman splitting of the spectrum are obtained up to the fourth order with respect to the field, as well as for lower and upper levels in the cluster, including the case of incidence on the center.Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 108, No. 3, pp. 339–387, September, 1996.     

Topologien auf Schnittmoduln kohärenter komplex-und reell-analytischer Garben

In this paper we consider coherent complex-analytic sheaves F on a complex-analytic space X, and study two canonical topologies, inductive resp. projective locally convex, on F(A,F) for subsets ax. We are interested in conditions on A for which these topologies coincide, and get as a main result that this is the case for real analytic spaces which can be imbedded in some ^l and have the original X as a complexification. By complexification we apply our results to coherent real-analytic sheaves.     

Strong Exceptional Sequences Provided by Quivers

Let Q be a finite quiver without oriented cycles. Denote by U (Q) the fine moduli space of stable thin sincere representations of Q with respect to the canonical stability notion. We prove Ext _(Q) ^l (U, U) = 0 for all l > 0 and compute the endomorphism algebra of the universal bundle U. Moreover, we obtain a necessary and sufficient condition for when this algebra is isomorphic to the path algebra of the quiver Q. If so, then the bounded derived categories of finitely generated right k Q-modules and that of coherent sheaves on (Q) are related via the full and faithful functor – _kQ ^L U.     

Entanglement of Multipartite Fermionic Coherent States for Pseudo-Hermitian Hamiltonians

We study the entanglement of multiqubit fermionic pseudo-Hermitian coherent states (FPHCSs) described by anticommutative Grassmann numbers. We introduce pseudo-Hermitian versions of well-known maximally entangled pure states, such as Bell, GHZ, Werner, and biseparable states, by integrating over the tensor products of FPHCSs with a suitable choice of Grassmannian weight functions. As an illustration, we apply the proposed method to the tensor product of two- and three-qubit pseudo-Hermitian systems. For a quantitative characteristic of entanglement of such states, we use a measure of entanglement determined by the corresponding concurrence function and average entropy.     

Equivariant Extensions of Categorical Groups

If is a group, then the category of -graded categorical groups is equivalent to the category of categorical groups supplied with a coherent left-action from . In this paper we use this equivalence and the homotopy classification of graded categorical groups and their homomorphisms to develop a theory of extensions of categorical groups when a fixed group of operators is acting. For this kind of extensions we show a suitable Schreiers theory and a precise theorem of classification, including obstruction theory, which generalizes both known results when the group of operators is trivial (categorical group extensions theory) or when the involved categorical groups are discrete (equivariant group extensions theory).Mathematics Subject Classifications (2000) 18D10, 18B40, 20J05, 20J06.Partially supported by MTM2004-01060.     

Categorical geometric skew Howe duality

We categorify the R-matrix isomorphism between tensor products of minuscule representations of U_q(\mathfraksl_n)U_{q}({\mathfrak{sl}}_{n}) by constructing an equivalence between the derived categories of coherent sheaves on the corresponding convolution products in the affine Grassmannian. The main step in the construction is a categorification of representations of U_q(\mathfraksl₂)U_{q}({\mathfrak{sl}}_{2}) which are related to representations of U_q(\mathfraksl_n)U_{q}({\mathfrak{sl}}_{n}) by quantum skew Howe duality. The resulting equivalence is part of the program of algebro-geometric categorification of Reshitikhin-Turaev tangle invariants developed by the first two authors.     

Quaternionic vector coherent states and the supersymmetric harmonic oscillator

The quaternionic vector coherent states are realized as coherent states of the supersymmetric harmonic oscillator with broken symmetry in analogy with the standard canonical coherent states of the ordinary harmonic oscillator. We study the nonclassical properties of the oscillator, such as the photon number distribution and signal-to-quantum-noise ratio in terms of these states and discuss the squeezing properties and the temporal stability of the coherent states. We obtain the orthogonal polynomials associated with the quaternionic vector coherent states. __________ Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 149, No. 1, pp. 80–98, October, 2006.