On spherical functions on the group SU(2) × SU(2) × SU(2)

We consider the group G:= SU(2) × ... × SU(2) (l factors), where SU(2) is the group of unitary 2 × 2 matrices with unit determinant. Let K ≃ SU(2) be the diagonal subgroup of G. We obtain the generating function of all K-spherical functions on G.     

Chain of interacting SU(2)4 anyons and quantum SU(2)k×$\overline { SU(2)_k } $ doubles

We consider a chain of SU(2) ₄ anyons with transitions to a topologically ordered phase state. For half-integer and integer indices of the type of strongly correlated excitations, we find an effective low-energy Hamiltonian that is an analogue of the standard Heisenberg Hamiltonian for quantum magnets. We describe the properties of the Hilbert spaces of the system eigenstates. For the Drinfeld quantum SU(2)_k×[`(SU(2)_k )]\overline {SU(2)_k } doubles, we use numerical computations to show that the largest eigenvalues of the adjacency matrix for graphs that are extended Dynkin diagrams coincide with the total quantum dimensions for the levels k = 2, 3, 4, 5. We also formulate a hypothesis about the reason for the universal behavior of the system in the long-wave limit.     

HORMANDER MULTIPLIER THEOREM ON SU(2)

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The Central Limit Theorem on SO0(p, q)/SO(p)×SO(q)

We obtain a central limit theorem for the space SO ₀(p, q)/SO(p)×SO(q). To achieve this, we derive a Taylor expansion of the spherical function on the group SO ₀(p, q).     

SU(2)上的一些逼近结果

SU(2)是行列式为1的2×2酉矩阵群,本文首先给出了 SU(2)上连续可微函数的 Fourier 系数的阶的估计,并通过具体例子说明所得估计式的精确程度;另外,根据α的大小,分0<α<1两种情况讨论了 Lip(α,SU(2))中函数的 Fourier 级数的收敛性情况,并对 Lip(α,SU(2))(α>0)中的类函数的 Fourier 级数的收敛性作了讨论.     

SU(2)规范场的恰当形式(欧空间)

应用数学机械化方法研究欧氏空间中SU(2)规范场的正规化问题.首先对Yang-Mills方程的表述进行了讨论,给出了一种具有物理和几何意义的YM-方程,称其为恰当的(exact)YM-方程.对于这种恰当的YM-方程,构造了一类线性微分变换,称之为SU(2)规范场的示性变换.经由示性变换,将非线性的恰当的YM-方程变为一组Laplace方程,实现了SU(2)规范场方程的线性化,即场方程的正规化.从而证明了SU(2)规范场存在3个独立的Yang-Mills规范场.     

SU(m+n)SU(m)×SU(n) ISOSCALAR FACTORS AND S(f_1+f_2)S(f_1)×S(f_2) OUTER-PRODUCT ISOSCALAR FACTORS

It is proved that the SU(m+n)SU(m)×SU(n) isoscalar factors (ISF) are equal to the S(f_1+f_2) outer-product ISF of the permutation group. Since the latter only depend on the partition labels, the values of the SU(m+n)SU(m)×SU(n) ISF do not depend on m and n explicitely. Consequently for a f(=f_1+f_2)-particle system, by evaluating the S(f) S(f_1)×S(f_2) outer-product ISF we can obtain all (an infinite number) of the SU (m+n) SU(m)×SU(n) ISF (or the f_2-particle coefficients of fractional parentage) for arbitrary m and n at a single stroke, in stead of one m and one n at a time. A simple method, the eigenfunction method, is given for evaluating the SU(m+n) SU(m)×SU(n) single particle ISF, while the many-particle ISF can be calculated in terms of the outer-product reduction coefficients and the transformation coefficients from the Yamanouchi basis to the S(f_1+f_2) S(f_1)×S(f_2) basis.     

On Hardy’s Theorem on SU(1, 1)

The classical Hardy theorem asserts that ■ and its Fourier transform ■ can not both be very rapidly decreasing.This theorem was generalized on Lie groups and also for the Fourier-Jacobi transform.However,on SU(1,1)there are infinitely many"good"functions in the sense that ■ and its spherical Fourier transform ■ both have good decay. In this paper,we shall characterize such functions on SU(1,1).     

关于SU(2)李群在强子分类中的应用

本文讨论SU(2)群表示在强子分类中的应用     

The θ Instantons in the SU(2) Higgs Theory

We consider topology-changing processes in the SU(2) Higgs theory. In the standard model of particle physics, they are accompanied by baryon- and lepton-number violation. At a fixed energy and multiplicity of the initial state, these processes are described by classical -instanton solutions. We find these solutions and calculate the suppression exponents for the probabilities of the topology-changing transitions at relatively low energies.     

SU(2)×SU(2)准自旋模型和自洽解的对称性恢复方法——Ⅰ.严格解和HF近似

本文提出了一个含有两类相互作用的准自旋模型,讨论了模型Hamilton量在SU(2)×SU(2)基中的严格解、基态相变和波函数的K结构,并用此模型探讨了HF近似的有效性。     

A Paley–Wiener Type Theorem for Singular Measures on $$(-1/2, 1/2)$$ ( - 1 / 2 , 1 / 2 )

Journal of Fourier Analysis and Applications - For a fixed singular Borel probability measure $$\mu $$ on $$(-1/2, 1/2)$$ , we give several characterizations of when an entire function is the...     

李代数SU(n)和阶化李代数SU(n/1)的不可约表示

本文对李代数SU(n)的生成元,引入了SU(n-1),SU(n-2),…SU(2)的不可约张量.并利用不可约张量的性质,求出了SU(n)的不可约表示,这些不可约表示的表达式比较简单.文中还给出了SU(n)的部分约化系数和Racah系数的代数表达式.在此基础上,求出了阶化李代数SU(n/1)的不可约表示.     

On the SO(n + 3) to SO(n) branching multiplicity space

We study the decomposition as an $\text{SO}(3)$-module of the multiplicity space corresponding to the branching from $\text{SO}(n+3)$ to $\text{SO}(n)$. Here, $\text{SO}(n)$ (resp. $\text{SO}(3)$) is considered embedded in $\text{SO}(n+3)$ in the upper left-hand block (resp. lower right-hand block). We show that when the highest weight of the irreducible representation of $\text{SO}(n)$ interlaces the highest weight of the irreducible representation of $\text{SO}(n+3)$, then the multiplicity space decomposes as a tensor product of $?(n+2)/2?$ reducible representations of $\text{SO}(3)$.     

SU(1,1)对称量子系统时间最优控制

基于李群分解,讨论了控制不受限情况下SU(1,1)对称量子控制系统的时间最优控制问题.针对系统控制哈密顿项为椭圆型和抛物型这两种情形,分别给出了实现任意演化矩阵所需要的最短时间.针对系统控制哈密顿项为双曲型情形,给出了实现任意演化矩阵所需要最短时间的一个上界.     

The Trace of Nuclear Operators on L p (μ) for σ-Finite Borel Measures on Second Countable Spaces

Let Ω be a second countable topological space and μ be a σ−finite measure on the Borel sets M{\mathcal{M}}. Let T be a nuclear operator on L^p(W,M,m){L^p({\Omega},{\mathcal{M}},\mu) }, 1 < p < ∞, in this work we establish a formula for the trace of T. A preliminary trace formula is established applying the general theory of traces on operator ideals introduced by Pietsch and a characterization of nuclear operators for σ−finite measures. We also use the Doob’s maximal theorem for martingales with the purpose of studying the kernel k(x, y) of T on the diagonal.     

SU(3)规范场的恰当形式(欧空间)

应用数学机械化方法讨论SU(3)规范场的规范化问题.首先提出一种具有明确几何意义的Yang-Mills方程,称其为恰当的Yang-Mills方程.然后构造了一类线性微分变换,称之为SU(3)规范场的示性变换,它具体给出联络和截面之间的微分关系.经由示性变换,将非线性的恰当的YM-方程变为一组线性Laplace方程,即实现了规范场YM-方程的线性化.从而证明了SU(3)规范场包括8个独立的Yang-Mills规范场.