超拟共形变换的Beltrami代数

本文构造了一种与超拟共形变换相联系的代数,即超Beltrami代数。该代数包含两个超共形(NSR)代数作为子代数。     

超拟共形变换的Beltrami代数

本文构造了一种与超拟共形变换相联系的代数,即超Beltrami代数。该代数包含两个超共形(NSR)代数作为子代数。 关键词：     

量子(超)代数在qp=1时的循环表示

利用商模方法和q-boson实现方法研究了量子(超)代数在q^p=1时的循环表示.对于与任意有限维单李代数相关的量子代数给出了两种方法的一般理论,而且推广到了量子超代数U_qosp(1.2).通过构造q-Heisenberg-Wey1超代数的循环表示,q-boson实现方法推广到构造某些高秩量子超代数的循环表示.     

玻色超共形Toda模型与Dressing变换

本文从玻色超共形Toda模型的经典γ矩阵出发,研究各种场量以及经典手征算子在Dressing变换下的性质,并且得到相应的量子代数.     

李超代数B(0,1)的超相干态表示

本文反相干态的概念推广到李超代数的情形.我们具体地构造了李超代数B(0,1)的超相干态,计算了B(0,1)生成元在超相干态表示中的矩阵元,获得了B(0,1)代数的一种非齐次微分实现.这种非齐次微分实现对研究量子力学中的准精确可解问题有用.     

超对称自对偶杨─Mills模型的Hamilton约化

本文研究了4维超对称自对偶杨-Mills模型的Hamilton约化.在左右对称的常约束下导出了4维超对称非阿贝尔Toda模型、相应的作用量以及线性系统.在主阶化下的1阶约束条件下,得到了4维超对称Toda模型.本文的约化对任意李超代数都成立,并不特别要求李超代数具有纯奇素根系.     

交换超算符方法的李代数研究

本文讨论了交换超算符方法的理论基础,结果表明由交换超算符所定义的算符集合g是一个李代数,交换超算符的定义就是李代数中内导子的定义,由此得出一些交换超算符间的代数关系。证明了g中所有算符诱导的超算符集合也是一个李代数,指出了与g对应的是由复盖群派生的,有内积定义的李群,而角动量超算符是由矢量场的内禀角动量和单位算符的直积所生成。结论是交换超算符方法的理论基础是李代数。     

核磁共振波谱的李代数表示与计算方法

本文讨论NMR波谱与李代数表示论之间的联系及NMR波谱解析的李代数方法中的基本问题.若NMR中交换超算符方法中的算符集合生成的李代数为g,本文将讨论g的自然表示和伴随表示,g的典型性质,g的根系结构.提出了解析NMR波谱的三种李代数方法,列举了实例,显示了计算的具体步骤.     

N=4超对称量子力学

利用Clifford代数构造了N=4超对称量子力学的一般形式,并讨论了它的实现.     

超Liouville模型精确解

运用Leznov-Saveliev代数分析方法和Drinfeld-Sokolov构造分别给出超协变形式和分量形式超Liouville模型精确解.     

Krichever-Novikov global operator formalism: NSR superstring in curved background

The Neveu-Schwarz-Ramond type II closed superstring is considered to evolve in a curved space-time manifold. The Krichever-Novikov global operator formalism is used to construct the generators of a super-conformal algebra on a Riemann surface . The computation for the quantum algebra of these generators is explicitly presented. It is shown that the theory is free from super-conformal anomalies if the target manifold is ten dimensional and satisfies the Ricci flatness condition.     

Quantum deformedsu(m/n) algebra and superconformal algebra on quantum superspace

We study a deformedsu(m/n) algebra on a quantum superspace. Some interesting aspects of the deformed algebra are shown. As an application of the deformed algebra we construct a deformed superconformal algebra. From the deformedsu(1/4) algebra, we derive deformed Lorentz, translation of Minkowski space,iso(2, 2) and its supersymmetric algebras as closed subalgebras with consistent automorphisms.     

On Infinitesimal Symmetries of the Self-Dual Yang-Mills Equations

Abstract

Infinite-dimensional algebra of all infinitesimal transformations of solutions of the self-dual Yang-Mills equations is described. It contains as subalgebras the infinite-dimensional algebras of hidden symmetries related to gauge and conformal transformations.     

Quasi-integrable and superintegrable systems from a ‘deformed-mass’ two-photon algebra

A quantum deformation of the two-photon (or Schrödinger) Lie algebra is introduced in order to construct newn-dimensional classical Hamiltonian systems which have (n?2) functionally independent integrals of motion in involution; we say that such Hamiltonians define quasi-integrable systems. Furthermore, Hopf subalgebras of this quantum two-photon algebra (quantum extended Galilei and harmonic oscillator algebras) provide another set of (n?1) integrals of motion for Hamiltonians defined on these Hopf subalgebras, so that they lead to superintegrable systems.     

N ＝ 4 Superconformal Quantum Mechanics in One Dimension and Its Algebraic Structure

N = 4 superconformal quantum mechanics of nonrelativistic particles in the typical 1/x2-potentials, which holds not only supersymmetry but also dynamical conformal symmetry, is studied. The corresponding superconformal quantum mechanical algebra, which contains supersymmetric quantum mechanical algebra with four supercharges and conformal algebra as subalgebras, and its two canonical group chains are established.     

Krichever-Novikov formulation of topological conformal field theory

The Krichever-Novikov (KN) global operator formalism is applied to construct a topological conformal field theory on a compact Riemann surface from an N=2 super-conformal field theory. The topological version of the KN algebra is derived and the BRST charge is shown to be genus-dependent in this formulation. This leads to an interesting cohomology structure for the physical subspace of the Hilbert space.     

Universal deformations of simple Lie algebras

This Letter examines the question of the structure of the Hopf algebra deformations of the universal enveloping algebras of the simple Lie algebras. Deformations of a complex algebra A are viewed as algebras defined over formal power series rings that specialize to A when the parameters go to 0. Only the case of U(sl(2,C)) is treated but the methods are general. Under the Ansatz that the two Borel subalgebras are deformed as Hopf algebras but possibly differently, we construct a universal two-parameter deformation.     

Logarithmic Intertwining Operators and Vertex Operators

This is the first in a series of papers where we study logarithmic intertwining operators for various vertex subalgebras of Heisenberg and lattice vertex algebras. In this paper we examine logarithmic intertwining operators associated with rank one Heisenberg vertex operator algebra M(1) _a , of central charge 1 − 12a ². We classify these operators in terms of depth and provide explicit constructions in all cases. Our intertwining operators resemble puncture operators appearing in quantum Liouville field theory. Furthermore, for a = 0 we focus on the vertex operator subalgebra L(1, 0) of M(1)₀ and obtain logarithmic intertwining operators among indecomposable Virasoro algebra modules. In particular, we construct explicitly a family of hidden logarithmic intertwining operators, i.e., those that operate among two ordinary and one genuine logarithmic L(1, 0)-module.     

A result on certain coset subalgebras of the βγ-system

In this paper, for the highest weight module V4 of sl(2,C) with the highest weight 4, we describe subalgebras Sβ(V4)θ+ and Sγ(V4)θ+ of the βγ-system coset S(V4)θ+ by giving their generators. These coset subalgebras are interesting, new examples of strongly finitely generated vertex algebra.